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Class 10 - chemical reactions

Total questions: 188

Worksheet time: 2hrs 14mins

Name
Class
Date
1.

For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

a)

A dark solid (precipitate) formed on the zinc metal.

b)

The zinc metal stayed silver-colored and shiny

c)

The CuSO4 solution evaporated after the zinc metal was added.

d)

None of these

2.

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

a)

CO2 + H2O --> C6H12O6 + O2

b)

C6O + H12O --> C6H12O2

c)

CO2 + H2O --> C6H12O6 + O2

d)

CO2 +H2O --> C6H12O6 +O2

3.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
4.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
5.

These are all models of the same molecule. What would this molecule look like in a chemical/molecular formula?

a)

CH

b)

C4H

c)

CH4

d)

4CH

6.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

7.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

8.

7.The equation

Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

9.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

10.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

11.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

12.

Chemical formula of lime water is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

13.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
14.
Which of the following are combination reactions?(i) 2KClO3⎯Heat⎯→ 2KCl + 3O2 (ii) MgO + H2O ⎯→ Mg(OH)2 (iii) 4Al + 3O2 ⎯→ 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe
a)
(a) (i) and (iii)
b)
(b) (iii) and (iv)
c)
(c) (ii) and (iv)
d)
(d) (ii) and (iii)
15.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a)
(a) 1:1
b)
(b) 2:1
c)
(c) 4:1
d)
(d) 1:2
16.
Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O
a)
(i) and (iv)
b)
(ii) only
c)
(i) and (ii)
d)
(iii) and (iv)
17.
Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)(i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent
a)
(i), (ii) and (iii)
b)
(iii) and (iv)
c)
(i), (ii) and (iv)
d)
(ii) and (iv)
18.
The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction
a)
(i) and (iv)
b)
(ii) and (iii)
c)
(i) and (iii)
d)
(iii) and (iv)
19.
A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?
a)
Na2Cl + H2
b)
 2NaCl + H2
c)
NaCl + 2H2
d)
 2NaCl + 2H2
20.
The first part of a balanced chemical equation is shown:  H2SO4 + 2NaOH → ________.  In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?
a)
2
b)
3
c)
4
d)
5
21.

A chemical reaction does not involve:

a)

Breaking of old chemical bonds and formation of new chemical bonds

b)

Rearrangement of the atoms of reactants to form new products

c)

Changing of the atoms of one element into those of another element to form new products

d)

Formation of new substances having entirely different properties than that of the reactants

22.

Rusting of iron involves a chemical reaction which is a combination of:

a)

Reduction as well as displacement reactions

b)

Oxidation as well as combination reactions

c)

Reduction as well as combination reactions

d)

Oxidation as well as displacement reactions

23.

When ferrous sulphate is heated strongly, it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

a)

Green to brown

b)

Blue to green

c)

Green to yellow

d)

Green to blue

24.

Which of the following does not corrode when exposed to the atmosphere?

a)

Silver

b)

Gold

c)

Copper

d)

Iron

25.

It is necessary to balance a chemical equation in order to satisfy the law of:

a)

Conservation of energy

b)

Conservation of mass

c)

Conservation of motion

d)

Conservation of momentum

26.

A substance which oxidizes itself and reduces others is known as:

a)

Reducing agent

b)

None of these

c)

Conservation of momentum

d)

Conservation of motion

27.

All the methods mentioned below can be used to prevent the food from getting rancid except:

a)

Storing the food in the air-tight containers

b)

Storing the food in refrigerator

c)

Keeping the food in clean and covered containers

d)

Always touching the food with clean hands

28.

The given chemical reaction represents:

a)

Hydrolysis

b)

Electrolysis of water

c)

Reduction as well as combination reactions

d)

Oxidation as well as displacement reactions

29.

The given diagram of experimental set-up is used to carry out:

a)

Combination reaction as well as double displacement reaction

b)

Redox reaction as well as displacement reaction

c)

Decomposition reaction as well as displacement reaction

d)

Double displacement reaction as well as redox reaction

30.

Combination of phosphorus and oxygen is an example of:

a)

Rancidity

b)

Burning of candle wax when heated

c)

Hydrolysis

d)

Decomposition reaction as well as displacement reaction

31.

Which of the following processes does not involve a chemical reaction?

a)

Ripening of banana

b)

Burning of candle wax when heated

c)

Digestion of food in our stomach

d)

Distillation of water

32.

In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitates formed are of:

a)

Magnesium ribbon

b)

Copper granules

c)

Sodium pellets

d)

Hydrochloric acid

33.

Which of the following gases is used in the storage of fat and oil containing foods for a long time?

a)

Oxygen gas

b)

Nitrogen gas

c)

Chlorine

d)

Barium sulphate

34.

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

a)

Remove the layer of magnesium carbonate from the ribbon surface

b)

Remove the layer of magnesium oxide from the ribbon surface

c)

Make the ribbon surface shinier

35.

The neutralization reaction between an acid and a base is a type of:

a)

Decomposition reaction

b)

Double displacement reaction

c)

An isomerization reaction

36.

What happens in a chemical reaction?

a)

Bonds between atoms break and/or are formed

b)

New atoms are created and/or removed

c)

Protons move from one atom to another

d)

Electrons change into protons

37.

The……equation verifies the law of conservation of matter

a)

N2+H2-->NH3

b)

NO +O2 --> NO2

c)

KCl + AgNO3 --> AgCl + KNO3

d)

H2O --> H2 +O2

38.

Identify the type of reaction :

Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

(a)  

39.

An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are

a)

X = Fe, Y = Fe2O3

b)

X = Ag, Y = Ag2S

c)

X = Cu, Y = CuO

d)

X = Al, Y = Al2O3

40.

Rancidity can be prevented by

a)

adding antioxidants

b)

storing food away from light

c)

keeping food in refrigerator

d)

all of these

41.

We store silver chloride in a dark coloured bottle because it is

a)

A white solid

b)

undergoes redox reaction

c)

to avoid action by sunlight

d)

none of the above

42.

Fatty foods become rancid due to the process of

a)

Oxidation

b)

Corrosion

c)

Reduction

d)

Hydrogenation

43.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

44.

Some stale food gives a bad taste and bad smell because of:

a)

Heating

b)

Displacement

c)

Corrosion

d)

Rancidity

45.

a copper penny turning greenish after a few years.

a)

Physical change

b)

Chemical change

46.

Which of the following is a balanced chemical equation?

a)

H2O2 → H2O + O2

b)

2Fe2O3 + 3C → 4Fe + 3CO2

c)

SO2 + O2 + 2H2O → 4H2SO4

d)

2Mg + HCl → MgCl2 + H2

47.
Copper chloride and aluminum react to produce aluminum chloride and copper.  Which of the following is the correctly balanced chemical equation for this reaction?
a)
CuCl2 + Al -> AlCl3 + Cu
b)
3CuCl2 + Al -> AlCl3 + 2Cu
c)
3CuCl2 + 2Al -> 2AlCl3 + 3Cu
d)
CuCl2 + 3Al -> AlCl3 + 2Cu
48.

Which type of reaction is:

2 NaBr + Ca(OH)2 → CaBr2 + 2 NaOH

a)
Synthesis
b)
Single Displacement
c)
Double Displacement
d)
Combustion
49.

Balancing the following:

____ Al + ____ HCl → ____ AlCl3 + ____ H2

a)
1,3,1,2
b)
2,3,2,3
c)
2,6,2,3
d)
3,2,6,2
50.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
51.

Balance the following:

____ Fe + ____ Cl2 → ____ FeCl3

a)
1,1,2
b)
1,3,1
c)
2,2,3
d)
2,3,2
52.

When copper powder is heated it gets coated with-

a)

black copper oxide

b)

yellow copper oxide

c)

red copper oxide

d)

None of these

53.

which of the following is a physical change?

a)

formation of curd from milk

b)

ripening of fruits

c)

Getting salt from sea water

d)

Burning of wood

54.

In the following equation:

Na2CO3 + xHCI -> 2NaCI +CO2 + H2O, the value of x is

a)

1

b)

2

c)

3

d)

4

55.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

56.

The process of wasting away of metals on exposure to moist air is called (a)   .

57.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

58.

What is observed when a solution of potassium iodide is added to silver nitrate solution?

a)

No reaction takes place

b)

White precipitate of silver iodide is formed

c)

Yellow precipitate of AgI is formed

d)

AgI is soluble in water

59.

Which of the reaction is used in black and white photography?

a)

Combination reaction

b)

Decomposition reaction

c)

Displacement reaction

d)

Oxidation reaction

60.

Why magnesium ribbon is cleaned before burning?

a)

To remove dust

b)

To remove magnesium oxide

c)

To remove ribbon oxide

d)

All of the above

61.

In which of the following category will you put the reaction of heating of calcium carbonate?

a)

Decomposition reaction

b)

Thermal decomposition reaction

c)

Endothermic reaction

d)

All of the above.

62.

Which of the following product is formed when calcium oxide reacts with water?

a)

Slaked lime

b)

Carbon dioxide

c)

Calcium oxide

d)

Oxygen gas

63.

Which of the following is not a physical change?

a)

Boiling of water to give water vapour

b)

Melting of ice to give water

c)

Dissolution of salt in water

d)

Combustion of Liquefied Petroleum Gas (LPG)

64.

Which of the following is not a balanced equation?

a)

H2+ O2→H2O

b)

Mg + CuSO2→MgSO4+ Cu

c)

NaOH + HCI→NaCI + H2O

d)

Zn + S ⟶ ZnS

65.

Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s) → 2Pb(s) + CO2(g)

i. Lead is getting reduced.

ii. Carbon dioxide is getting oxidized.

iii. Carbon is getting oxidized.

iv. Lead oxide is getting reduced.→

a)

(i) and (ii)

b)

(i) and (iii)

c)

(i), (ii) and (iii)

d)

(iv) only

66.

Combination of phosphorus and oxygen is an example of -

a)

oxidation

b)

reduction

c)

rancidity

d)

None of these

67.

When copper powder is heated it gets coated with-

a)

black copper oxide

b)

yellow copper oxide

c)

red copper oxide

d)

None of these

68.

Black and white photography uses-

a)

decomposition of silver chloride

b)

decomposition of silver bromide

c)

both

d)

none of these

69.

White silver chloride in sunlight turns to-

a)

grey

b)

yellow

c)

remain white

d)

red

70.

In the equation, NaOH + HNO3 ------> NaNO3 + H2O nitric acid is acting as-

a)

An Oxidising agent

b)

an acid

c)

a nitrating agent

d)

a dehydrating agent

71.

A redox reaction is one in which-

a)

both the substance are reducedc

b)

both the substance are oxidised

c)

an acid is neutralilsed by the base

d)

one substance is oxidised while the other is reduced

72.

The reaction in which two compounds exchange their ions to form two new compounds is -

a)

a displacement reaction

b)

a decomposition reaction

c)

an isomerization reaction

d)

a double displacement reactions

73.

Zn + H2SO4 --------> ZnSO4 + H2

Above reaction is -

a)

decomposition reaction

b)

single displacement reaction

c)

combination reaction

d)

synthesis reaction

74.

A student added dilute HCl to a test tube containing zinc granules and made following observations:

a)

the zinc surface became dull and black

b)

a gas evolved which burnt with a pop sound

c)

the solution remained colourless

d)

the solution becomes green in colour

75.

What happens when copper rod is dipped in iron sulphate solution?

a)

Copper displaces iron

b)

Blue colour of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

76.

which of the following is a physical change?

a)

formation of curd from milk

b)

ripening of fruits

c)

Getting salt from sea water

d)

Burning of wood

77.

A substance which oxidises itself and reduces other is known as -

a)

oxidising agent

b)

reducing agent

c)

both of these

d)

none of these

78.

What happens in a chemical reaction?

a)

Bonds between atoms break and/or are formed

b)

New atoms are created and/or removed

c)

Protons move from one atom to another

d)

Electrons change into protons

79.

The……equation verifies the law of conservation of matter

a)

N2+H2-->NH3

b)

NO +O2 --> NO2

c)

KCl + AgNO3 --> AgCl + KNO3

d)

H2O --> H2 +O2

80.

Identify the type of reaction :

Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

(a)  

81.

An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are

a)

X = Fe, Y = Fe2O3

b)

X = Ag, Y = Ag2S

c)

X = Cu, Y = CuO

d)

X = Al, Y = Al2O3

82.

Rancidity can be prevented by

a)

adding antioxidants

b)

storing food away from light

c)

keeping food in refrigerator

d)

all of these

83.

We store silver chloride in a dark coloured bottle because it is

a)

A white solid

b)

undergoes redox reaction

c)

to avoid action by sunlight

d)

none of the above

84.

Fatty foods become rancid due to the process of

a)

Oxidation

b)

Corrosion

c)

Reduction

d)

Hydrogenation

85.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

86.

Some stale food gives a bad taste and bad smell because of:

a)

Heating

b)

Displacement

c)

Corrosion

d)

Rancidity

87.

a copper penny turning greenish after a few years.

a)

Physical change

b)

Chemical change

88.

Which of the following is a balanced chemical equation?

a)

H2O2 → H2O + O2

b)

2Fe2O3 + 3C → 4Fe + 3CO2

c)

SO2 + O2 + 2H2O → 4H2SO4

d)

2Mg + HCl → MgCl2 + H2

89.
Copper chloride and aluminum react to produce aluminum chloride and copper.  Which of the following is the correctly balanced chemical equation for this reaction?
a)
CuCl2 + Al -> AlCl3 + Cu
b)
3CuCl2 + Al -> AlCl3 + 2Cu
c)
3CuCl2 + 2Al -> 2AlCl3 + 3Cu
d)
CuCl2 + 3Al -> AlCl3 + 2Cu
90.

Which type of reaction is:

2 NaBr + Ca(OH)2 → CaBr2 + 2 NaOH

a)
Synthesis
b)
Single Displacement
c)
Double Displacement
d)
Combustion
91.

Balancing the following:

____ Al + ____ HCl → ____ AlCl3 + ____ H2

a)
1,3,1,2
b)
2,3,2,3
c)
2,6,2,3
d)
3,2,6,2
92.

Balance the following:

____ Fe + ____ Cl2 → ____ FeCl3

a)
1,1,2
b)
1,3,1
c)
2,2,3
d)
2,3,2
93.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
94.

When copper powder is heated it gets coated with-

a)

black copper oxide

b)

yellow copper oxide

c)

red copper oxide

d)

None of these

95.

which of the following is a physical change?

a)

formation of curd from milk

b)

ripening of fruits

c)

Getting salt from sea water

d)

Burning of wood

96.

In the following equation:

Na2CO3 + xHCI -> 2NaCI +CO2 + H2O, the value of x is

a)

1

b)

2

c)

3

d)

4

97.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

98.

The process of wasting away of metals on exposure to moist air is called (a)   .

99.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

100.

What is observed when a solution of potassium iodide is added to silver nitrate solution?

a)

No reaction takes place

b)

White precipitate of silver iodide is formed

c)

Yellow precipitate of AgI is formed

d)

AgI is soluble in water

101.

Why magnesium ribbon is cleaned before burning?

a)

To remove dust

b)

To remove magnesium oxide

c)

To remove ribbon oxide

d)

All of the above

102.

In which of the following category will you put the reaction of heating of calcium carbonate?

a)

Decomposition reaction

b)

Thermal decomposition reaction

c)

Endothermic reaction

d)

All of the above.

103.

Which of the following product is formed when calcium oxide reacts with water?

a)

Slaked lime

b)

Carbon dioxide

c)

Calcium oxide

d)

Oxygen gas

104.

Which of the following is not a physical change?

a)

Boiling of water to give water vapour

b)

Melting of ice to give water

c)

Dissolution of salt in water

d)

Combustion of Liquefied Petroleum Gas (LPG)

105.

Which of the following is not a balanced equation?

a)

H2+ O2→H2O

b)

Mg + CuSO2→MgSO4+ Cu

c)

NaOH + HCI→NaCI + H2O

d)

Zn + S ⟶ ZnS

106.

Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s) → 2Pb(s) + CO2(g)

i. Lead is getting reduced.

ii. Carbon dioxide is getting oxidized.

iii. Carbon is getting oxidized.

iv. Lead oxide is getting reduced.→

a)

(i) and (ii)

b)

(i) and (iii)

c)

(i), (ii) and (iii)

d)

(iv) only

107.

Combination of phosphorus and oxygen is an example of -

a)

oxidation

b)

reduction

c)

rancidity

d)

None of these

108.

When copper powder is heated it gets coated with-

a)

black copper oxide

b)

yellow copper oxide

c)

red copper oxide

d)

None of these

109.

Black and white photography uses-

a)

decomposition of silver chloride

b)

decomposition of silver bromide

c)

both

d)

none of these

110.

White silver chloride in sunlight turns to-

a)

grey

b)

yellow

c)

remain white

d)

red

111.

In the equation, NaOH + HNO3 ------> NaNO3 + H2O nitric acid is acting as-

a)

An Oxidising agent

b)

an acid

c)

a nitrating agent

d)

a dehydrating agent

112.

A redox reaction is one in which-

a)

both the substance are reducedc

b)

both the substance are oxidised

c)

an acid is neutralilsed by the base

d)

one substance is oxidised while the other is reduced

113.

The reaction in which two compounds exchange their ions to form two new compounds is -

a)

a displacement reaction

b)

a decomposition reaction

c)

an isomerization reaction

d)

a double displacement reactions

114.

Zn + H2SO4 --------> ZnSO4 + H2

Above reaction is -

a)

decomposition reaction

b)

single displacement reaction

c)

combination reaction

d)

synthesis reaction

115.

A student added dilute HCl to a test tube containing zinc granules and made following observations:

a)

the zinc surface became dull and black

b)

a gas evolved which burnt with a pop sound

c)

the solution remained colourless

d)

the solution becomes green in colour

116.

What happens when copper rod is dipped in iron sulphate solution?

a)

Copper displaces iron

b)

Blue colour of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

117.

which of the following is a physical change?

a)

formation of curd from milk

b)

ripening of fruits

c)

Getting salt from sea water

d)

Burning of wood

118.

Combination of phosphorus and oxygen is an example of -

a)

oxidation

b)

reduction

c)

rancidity

d)

None of these

119.

When copper powder is heated it gets coated with-

a)

black copper oxide

b)

yellow copper oxide

c)

red copper oxide

d)

None of these

120.

Black and white photography uses-

a)

decomposition of silver chloride

b)

decomposition of silver bromide

c)

both

d)

none of these

121.

White silver chloride in sunlight turns to-

a)

grey

b)

yellow

c)

remain white

d)

red

122.

In the equation, NaOH + HNO3 ------> NaNO3 + H2O nitric acid is acting as-

a)

An Oxidising agent

b)

an acid

c)

a nitrating agent

d)

a dehydrating agent

123.

A redox reaction is one in which-

a)

both the substance are reducedc

b)

both the substance are oxidised

c)

an acid is neutralilsed by the base

d)

one substance is oxidised while the other is reduced

124.

The reaction in which two compounds exchange their ions to form two new compounds is -

a)

a displacement reaction

b)

a decomposition reaction

c)

an isomerization reaction

d)

a double displacement reactions

125.

Zn + H2SO4 --------> ZnSO4 + H2

Above reaction is -

a)

decomposition reaction

b)

single displacement reaction

c)

combination reaction

d)

synthesis reaction

126.

A student added dilute HCl to a test tube containing zinc granules and made following observations:

a)

the zinc surface became dull and black

b)

a gas evolved which burnt with a pop sound

c)

the solution remained colourless

d)

the solution becomes green in colour

127.

What happens when copper rod is dipped in iron sulphate solution?

a)

Copper displaces iron

b)

Blue colour of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

128.

which of the following is a physical change?

a)

formation of curd from milk

b)

ripening of fruits

c)

Getting salt from sea water

d)

Burning of wood

129.

Assertion (A): Magnesium ribbon keeps on burning in atmosphere of nitrogen.

Reason (R) : Magnesium reacts with nitrogen to form magnesium nitride and this reaction is combination reaction.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

130.

Assertion (A): Chips manufacturers usually Ilush bags of chips with gas such as nitrogen to prevent the chips from getting oxidised.

Reason (R): This increase the taste ot the chips and helps in their digestion.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

131.

Assertion (A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.

Reason (R): Zinc reacts with oxygen to form zinc oxide

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

132.

Assertion (A): Iron articles are painted so as to prevent them from rusting.

Reason (R): When the surface of iron is coated with paint, its surface does not come in contact with oxygen and moisture therefore rusting does not take place.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

133.

Assertion (A): When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

Reason (R): The decomposition reaction takes place on application of heat, therefore, it is an endothermic reaction.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

134.

Assertion (A) : The balancing of chemical equations is based on law of conservation of mass.

Reason (R) : Total mass of reactants is equal to total mass of products.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

135.

Assertion (A) : Chemical reaction changes the physical and chemical state of a substance.

Reason (R) : When electric current is passed through water (liquid), it decomposes to produce hydrogen and oxygen gases.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

136.

Assertion (A): Corrosion of iron is commonly known as rusting.

Reason (R) : Corrosion of iron occurs in presence of water and air.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

137.

Assertion (A) : In a reaction of copper with oxygen, copper serves as a reducing agent.

Reason (R) : The substance which gains oxygen in a chemical reaction acts as a reducing agent.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

138.

Assertion (A): Pungent smelling gas is produced when sulphur burns in air.

Reason (R) : Sulphur trioxide is formed on reaction of sulphur with oxygen.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

139.

Assertion (A) : White silver chloride turns grey in sunlight.

Reason (R) : Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

140.

Assertion (A) : Brown fumes are produced when lead nitrate is heated.Reason (R) : Nitrogen dioxide gas is produced as a by product due to the decomposition of lead nitrate.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

141.

Assertion (A) : Calcium carbonate when heated gives calcium oxide and water.Reason (R) : On heating calcium carbonate, decomposition reaction takes place.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

142.

Assertion (A): AgBr is used on photographic and X-ray film.

Reason (R): AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and under goes decomposition reaction.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

143.

Assertion (A) : When HCl is added to zinc granules, a chemical reaction occurs.

Reason (R) : Evolution of a gas and change in colour indicate that the chemical reaction is taking place.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

144.

MnO2 + 4HCl → 2 + 2H2O + Cl2

Identify the substance oxidized in the above . equation.

a)

(a) MnCl2

b)

HCl

c)

H2OH_2O  

d)

MnO2

145.

Assertion (A): A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.

Reason (R): Lead nitrate reacts with potassium iodide to form yellow ppt. of lead iodide and the reaction is double displacement as well as precipitation reaction.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

146.

When Ag is exposed to air it gets a black coating of

a)

AgNO3

b)

Ag2S

c)

Ag2O

d)

Ag2CO3

147.

Assertion (A): Rusting of iron metal is the most common form of corrosion.

Reason (R): The effect of rusting of iron can be reversed if they are left open in sunlight.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

148.

MnO2 + 4HCl → 2 + 2H2O + Cl2

Identify the substance oxidized in the above . equation.

a)

(a) MnCl2

b)

HCl

c)

H2OH_2O  

d)

MnO2

149.

H2+O2  =  H2OH_2+O_2\ \ =\ \ H_2O  Is an example of which reaction?

a)

Decomposition

b)

Double displacement

c)

Dispalcement

d)

Combination

150.

Why do we need to balance the chemical equations?

a)

To maintain the law of conservation of mass

b)

To maintain the law of constant proportions

c)

To maintain law of constant mass

d)

To write the chemical formula of the given compounds.

151.

By which method can we decompose water molecule?

a)

Heating

b)

Electrolysis

c)

Oxidation

d)

Reduction

152.

Why should we rub a Magnesium ribbon with sand paper before using it?

a)

To remove the layer of carbon-di-oxide formed on it.

b)

To remove the layer of chlorine formed on it.

c)

To remove the layer of oxygen formed on it.

d)

To remove the layer of neon formed on it.

153.

1. Which of the following is a displacement reaction?

a)

MgCO3 → MgO +CO2MgCO_{3\ }\rightarrow\ MgO\ +CO_2  

b)

2Na +2H2O → 2NaOH +H22Na\ +2H_2O\ \rightarrow\ 2NaOH\ +H_2  

c)

Mg+O2 → 2MgO5Mg+O_2\ \rightarrow\ 2MgO_5  

d)

Oh +H→HoOh\ +H\rightarrow Ho  

154.

Magnesium and oxygen react with each other and form

a)

Magnesium di oxide.

b)

Magnesium triphosphate

c)

Magnesium oxide.

d)

Magnesium Hydroxide

155.

A chemical reaction in which two or more substances combine with each other to form a single substance is called?

a)

Double displacement reaction

b)

Displacement reaction

c)

Combination reaction

d)

Decomposition rection

156.

Why is repiration considered a exothermic reaction?

4 lines
157.

Assertion (A): In a balanced chemical equation, total mass of the reactants is equal to the total mass of the products.

Reason (R): Mass can neither be created nor destroyed during a chemical change.

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

158.

Which of the following is not the characteristics of chemical reactions?

a)

Change in colour

b)

Change in temperature

c)

Evolution of gas

d)

None of the above

159.

Give the ratio in which hydrogen and oxygen are present in water by volume.

a)

1:2

b)

1:1

c)

2:1

d)

1;8

160.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
161.

A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.

a)

CaOCl2

b)

Ca (OH)2

c)

CaO

d)

CaCO3

162.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
163.

Which among the following is(are) double displacement reaction(s)?

(i) Pb + CuCl2 → PbCl2 + Cu

(ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl

(iii) C + O2 → CO2

(iv) CH4 + 2O2 → CO2 + 2H2O

a)

(i) and (iv)

b)

(ii) only

c)

(i) and (ii)

d)

(iii) and (iv)

164.

Assertion (A): Exposure of silver chloride to sunlight for a long duration turns grey due to the formation of silver by decomposition of silver chloride.

Reason (R): In this process, sublimation of silver chloride takes place.

a)

a) Both A and R are true and R is the correct explanation of

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

165.
A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?
a)
Na2Cl + H2
b)
 2NaCl + H2
c)
NaCl + 2H2
d)
 2NaCl + 2H2
166.

Chemical formula of lime water is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

167.
The first part of a balanced chemical equation is shown:  H2SO4 + 2NaOH → ________.  In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?
a)
2
b)
3
c)
4
d)
5
168.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

169.

The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

(i) displacement reaction

(ii) combination reaction

(iii) redox reaction

(iv) neutralisation reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (iii)

d)

(iii) and (iv)

170.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

171.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

172.

For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

a)

A dark solid (precipitate) formed on the zinc metal.

b)

The zinc metal stayed silver-colored and shiny

c)

The CuSO4 solution evaporated after the zinc metal was added.

d)

None of these

173.

Which of the following are combination reactions?

(i) 2KClO3⎯Heat⎯→ 2KCl + 3O2

(ii) MgO + H2O ⎯→ Mg(OH)2

(iii) 4Al + 3O2 ⎯→ 2Al2 O3

(iv) Zn + FeSO4 → ZnSO4 + Fe

a)

(a) (i) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (ii) and (iv)

d)

(d) (ii) and (iii)

174.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a)
(a) 1:1
b)
(b) 2:1
c)
(c) 4:1
d)
(d) 1:2
175.

7.The equation

Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

176.

When the state of a substance is written in brackets in a chemical reaction, “aq” stands for ___

a)

Aqueous

b)

Liquid

c)

Unknown

d)

Water

177.

Identify the type of reaction :

Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.

(a)  

178.

Photosynthesis is a (a)   reaction

(CLUE :HEAT ABSORBED)

179.

Calcium carbonate decomposes into calcium oxide and carbon dioxide. The reactant is:

a)

Calcium Carbonate

b)

Calcium oxide

c)

carbon dioxide

d)

water

180.

Which of the following reaction can also be termed as a thermal decomposition reaction?

a)

(a) Combination reaction

b)

(b) Decomposition reaction

c)

(c) Displacement reaction

d)

(d) Double displacement reaction

181.

In electrolysis of water (acidified), the gases that are evolved at anode and cathode respectively are _________ and _______.

(DO NOT TYPE *AND* IN ANSWER)

(a)  

182.

What will be the values of the coefficients x, y, and z if the given chemical equation is balanced?

xFeCl3 + yMgO→ Fe2O3 + zMgCl2

a)

x = 3, y = 2, z = 3

b)

x = 3, y = 2, z = 2

c)

x = 2, y = 4, z = 3

d)

x = 2, y = 3, z = 3

183.

During photosynthesis, the light energy is converted to chemical energy that is later used by the green plants for their activities. This is an example of ________________ reaction.

a)

endothermic

b)

exothermic

c)

precipitation

d)

combination

184.

Assertion (A) : Decomposition of vegetable matter into compost is an example of exothermic reactions.

Reason (R) : Exothermic reaction are those reactions in which heat is evolved

a)

a) Both A and R are true and R is the correct explanation of A

b)

b) Both A and R are true but R is not the correct explanation of A.

c)

c) A is true but R is false.

d)

d) A is false but R is true.

185.

Precipitation and neutralization reaction are example of

a)

Displacement reaction

b)

Double displacement reaction

c)

decomposition reaction

d)

direct combination reaction

186.

A/an (a)   reaction is characterised by the evolution of heat energy

187.

A_______ coloured layer of copper appears onto the the surface of the zinc ribbon when reacted with copper sulphate.

a)

blue

b)

red

c)

white

d)

black

188.

A student has been collecting Silver coins and Copper coins. One day she observed a black coating on Silver coins and a green coating on Copper coins. Which chemical phenomenon is responsible for these coatings?

a)

corrosion

b)

rancidity

c)

redox

d)

none

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