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chemistry

Total questions: 142

Worksheet time: 2hrs 52mins

Name
Class
Date
1.
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)
2.
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)
3.
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)
4.
Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(iii) and (iv)
5.
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?(i) In beakers A and B, exothermic process has occurred. (ii) In beakers A and B, endothermic process has occurred. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred.
a)
(i) only
b)
(ii) only
c)
(i) and (iv)
d)
(ii) and (iii)
6.
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
a)
KMnO4 is an oxidising agent, it oxidises FeSO4
b)
FeSO4 acts as an oxidising agent and oxidises KMnO4
c)
The colour disappears due to dilution; no reaction is involved
d)
KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound.
7.
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)
8.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
9.
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?(i) It is an endothermic reaction (ii) It is an exothermic reaction (iii) The pH of the resulting solution will be more than seven (iv) The pH of the resulting solution will be less than seven
a)
(a) (i) and (ii)
b)
(b) (ii) and (iii)
c)
(c) (i) and (iv)
d)
(d) (iii) and (iv)
10.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction
a)
(a) (i) only
b)
(b) (ii) only
c)
(c) (iv) only
d)
(d) (ii) and (iv)
11.
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
12.
Which of the following is(are) an endothermic process(es)? (i) Dilution of sulphuric acid(ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water
a)
(a) (i) and (iii)
b)
(b) (ii) only
c)
(c) (iii) only
d)
(d) (ii) and (iv)
13.
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
a)
(a) Lead sulphate (insoluble)
b)
(b) Lead acetate
c)
(c) Ammonium nitrate
d)
(d) Potassium sulphate
14.
14. Which of the following gases can be used for storage of fresh sample of an oil for a long time?
a)
(a) Carbon dioxide or oxygen
b)
(b) Nitrogen or oxygen
c)
(c) Carbon dioxide or helium
d)
(d) Helium or nitrogen
15.
Potassium Chlorate is heated in presence of catalyst to produce oxygen and potassium chloride.Which of the following statement(s) is(are) correct about the reaction?
a)
(a) It is a decomposition reaction and endothermic in nature
b)
(b) It is a combination reaction
c)
It is a decomposition reaction and accompanied by release of heat
d)
(d) It is a photochemical decomposition reaction and exothermic in nature
16.
Which one of the following processes involve chemical reactions?
a)
Storing of oxygen gas under pressure in a gas cylinder
b)
(b) Liquefaction of air
c)
(c) Keeping petrol in a china dish in the open
d)
(d) Heating copper wire in presence of air at high temperature
17.
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
a)
(a) 2H2(l) + O2(l) → 2H2O(g)
b)
(b) 2H2(g) + O2(l) → 2H2O(l)
c)
(c) 2H2(g) + O2(g) → 2H2O(l)
d)
(d) 2H2(g) + O2(g) → 2H2O(g)
18.
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)
19.

Rancidity is a process in which fat/oils smell due to the change process of

a)

oxidation

b)

reduction

c)

displacement

d)

neutralization

20.

Colour of which metal changes to greem due to corrosion?

a)

Cu

b)

Al

c)

Fe

d)

Ag

21.
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
22.
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
23.
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)
24.
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)
25.
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)
26.
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
27.
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)
28.
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.
29.

Chemical formula of lime water is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

30.

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

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

31.

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

32.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

33.

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

34.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

35.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

36.

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

37.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
38.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
39.

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

40.

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

41.

The following is an example of :

4NH3 + 5O2 -----> 4NO + 6H2O

(i) displacement reaction

(ii) combustion reaction

(iii) redox reaction

(iv) neutralization reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (ii)

d)

(iii) and (iv)

42.

The electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water

a)

1:1

b)

2:1

c)

4:1

d)

1:2

43.

Which of the following processes involve chemical reactions

a)

Storing of oxygen gas under pressure in a gas cylinder

b)

Liquification of air

c)

Keeping petrol in a china dish in open

d)

Heating copper wire in the presence of air at high temperature

44.

What is the formula of magnesium nitride?

a)

MgN3

b)

Mg2N3

c)

Mg3N2

d)

Mg2N

45.

What are the products of decomposition of PbCO3

a)

PbO + CO2

b)

Pb + CO2 + O2

c)

PbO + C

d)

Pb + C + O2

46.

A metal 'M' reacts with an acid according to the equation :

M + H+ --------> M3+ + H2

The metal can be

a)

Potassium

b)

Magnesium

c)

Aluminium

d)

Barium

47.

When dil. sulphuric acid is added to pieces of iron sulphie, hydrogen sulphide gas is produced and soluble ferrous sulphate is produced. The type of chemical reaction involved is :

a)

Decomposition reaction

b)

Combination reaction

c)

Displacement Reaction

d)

Double displacement reaction

48.

When ethane reacts with oxygen present in air it produces CO2 and water. In this reaction how many moles of oxygen is used?

a)

3

b)

5/2

c)

2

d)

7/2

49.

A powdered salt X was heated in a dry test tube and evolution of brown fumes of nitrogen dioxide and a yellow residue of lead oxide is formed. The salt X is :

a)

Magnesium Carbonate

b)

Lead nitrate

c)

Ammonium Sulphate

d)

Calcium carbonate

50.

Which of the following is not a type of reduction

a)

Gain of hydrogen

b)

loss of electron

c)

loss of oxygen

d)

gain of electron

51.

Reaction of Na and H2O gives a very strong base , NaOH and another product, a gas. How do you test for this gas ?

a)

Pass it through lime water, turns milky.

b)

Rotten egg smell

c)

Burns with a dazzling flame

d)

Burns with a pop sound

52.

Which of the following is endothermic reaction?

a)

Dissolution of ammonium chloride in water

b)

Dilution of sulphuric acid

c)

Dissolution of sodium hydroxide in water

d)

Reaction of zinc with HCl

53.

when does a chemical reaction take place ?

a)

when a physical change occurs

b)

when a chemical change occurs

c)

both a and b

d)

none of the above

54.

What are the substances on the left side called and right side of the chemical equation called respectively ?

a)

products and reactants

b)

groups and electrons

c)

nothing

d)

reactants and products

55.

Which of the following is not a physical change?

a)

(a) Boiling of water to give water vapour

b)

(b) Melting of ice to give water

c)

(c) Dissolution of salt in water

d)

(d) Combustion of Liquefied Petroleum Gas (LPG)

56.

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)

(a) (i), (ii) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (i), (ii) and (iv)

d)

(d) (ii) and (iv)

57.

which of the following observations helps to determine that a chemical reaction has taken place ?

a)

change in state

b)

change in color

c)

change in temperature

d)

all of the above

58.

A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?

a)

X =slaked lime , Y = nitrogen , B=calcium oxide

b)

X =Calcium Hydroxide, Y=Oxygen, B = Calcium carbonate

c)

X= slaked lime, Y=Carbon oxide,B= calcium chloride

d)

X= slaked lime,Y=Carbon dioxide,B=Calcium carbonate

59.

What is the process that is happening in this image ? And also give the name of the two gas that are present in two test tubes and the ratio they(gases) are present in .

a)

process= thermal decomposition,

gases present=hydrogen,carbon dioxide, ratio=2:1

b)

process=corrosion,

gases present=oxygen,hydroxide, ratio=2:1

c)

process=electrolysis of hydrogen polyoxide

gases present=hydrogen,oxygen, ratio=2:1

d)

process=electrolysis of water

gases present=hydrogen,oxygen,ratio=4:2

60.

Choose the correct balanced equation of barium chloride and aluminium sulphate.

a)

3BaCl2+Al2(SO4)3→3BaSO4+2AlCl3

b)

2BaCl2+Al2(SO4)3→2BaSO4+2AlCl3

c)

6BaCl2+2Al2(SO4)3→6BaSO4+4AlCl3

d)

none of the above

61.

Choose the incorrect statement from the following options about saving foods from rancidity.

a)

keep food items in air tight containers

b)

flushing food items with carbon dioxide

c)

flushing food items with nitrogen

d)

keep food items in air loose containers

62.
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)
63.

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

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

64.

A chemical equation should be balanced to :

a)

show conservation of energy

b)

show conservation of mass

c)

to make equation attractive

d)

All of the above

65.

In which of the following process a chemical reaction has taken place?

a)

Ice melts into water

b)

A wet shirt got dried in sunlight

c)

A brown layer is formed over iron rod kept in air

d)

sugar getting dissolved in water

66.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
67.
Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(iii) and (iv)
68.

The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:

a)

Exothermic process

b)

Endothermic process

c)

Reversible process

d)

Physical process

69.

A chemical reaction does not involve:

a)

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

b)

Breaking of old chemical bonds and formation of new chemical bonds

c)

Rearrangement of the atoms of reactants to form new products

d)

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

70.

One of the following processes does not involve a chemical reaction. That is:

a)

Melting of candle wax when heated

b)

Burning of candle wax when heated

c)

Digestion of food in our stomach

d)

Ripening of banana

71.

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

a)

Conservation of motion

b)

Conservation of momentum

c)

Conservation of energy

d)

Conservation of mass

72.

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)

Blue to green.

b)

Green to blue.

c)

Green to brown.

d)

Green to yellow.

73.

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

a)

Copper granules

b)

Magnesium ribbon

c)

Sodium pellets

d)

Aluminium dust

74.

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

a)

Double displacement reaction

b)

Displacement reaction

c)

Addition reaction

d)

Decomposition reaction

75.

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

a)

Make the ribbon surface shinier

b)

Remove the layer of magnesium oxide from the ribbon surface

c)

Remove the layer of magnesium carbonate from the ribbon surface

d)

Remove the moisture from the ribbon surface

76.

What happens when copper rod is dipped in iron sulphate solution :-

a)

Copper displaces iron

b)

Blue color of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

77.

What is the another name of quick lime?

a)

Calcium hydroxide

b)

Calcium oxide

c)

Carbon dioxide

d)

Sodium oxide

78.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All of the above

79.

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

80.

What happens when silver chloride is put under sunlight?

a)

Silver metal and chlorine gas are formed

b)

Silver metal and hydrogen gas are formed

c)

Only silver metal is formed

d)

Only hydrogen gas is formed

81.

What happens when carbon dioxide is passed in lime water?

a)

Lime water turns milky because of formation of calcium carbonate

b)

Lime water turns milky because of formation of water

c)

Lime water turns red because of formation permanganate

d)

Lime water turns red because of formation of copper sulphate

82.

What happens when sodium sulphate solution is mixed with the solution of barium chloride?

a)

No reaction takes place

b)

Barium sulphate is formed

c)

Sulphur dioxide gas is formed

d)

Sodium sulphate is formed

83.

Why are articles made of iron painted to prevent rust?

a)

Paint makes articles made of iron beautiful

b)

Paint prevents iron articles to come in contact with moisture present in air.

c)

Paint prevents iron articles to getting sticky

d)

All of the above

84.

Which of the following is termed as rancidity?

a)

Reduction of oxygen present in food

b)

Oxidation of sugar present in food

c)

Oxidation of oil present in food

d)

All of the above

85.

How rancidity can be prevented?

a)

By adding antioxidants in food

b)

By adding more oxygen to food

c)

By keeping food items in open

d)

All of the above

86.

Which of the following is termed as exothermic reaction?

a)

Reaction in which heat is evolved

b)

Reaction in which heat is absorbed

c)

Reaction in which there is loss of oxygen

d)

Reaction in which there is gain of hydrogen

87.

Which of the following termed as reducing agent?

a)

Which gives oxygen

b)

Which removes oxygen

c)

Which removes hydrogen

d)

All of the above

88.

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

a)

Make the ribbon surface shinier

b)

Remove the layer of magnesium oxide from the ribbon surface

c)

Remove the layer of magnesium carbonate from the ribbon surface

d)

Remove the moisture from the ribbon surface

89.

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

a)

Hydrochloric acid

b)

Barium sulphate

c)

Chlorine

d)

Sulphur

90.

The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:

a)

Exothermic process

b)

Endothermic process

c)

Reversible process

d)

Physical process

91.

A chemical reaction does not involve:

a)

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

b)

Breaking of old chemical bonds and formation of new chemical bonds

c)

Rearrangement of the atoms of reactants to form new products

d)

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

92.

One of the following processes does not involve a chemical reaction. That is:

a)

Melting of candle wax when heated

b)

Burning of candle wax when heated

c)

Digestion of food in our stomach

d)

Ripening of banana

93.

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

a)

Conservation of motion

b)

Conservation of momentum

c)

Conservation of energy

d)

Conservation of mass

94.

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

i. Storing the food in the air-tight containers

ii. Storing the food in refrigerator

iii. Keeping the food in clean and covered containers

iv. Always touching the food with clean hands

a)

(i) and (ii)

b)

(i) and (iii)

c)

(i), (iii) and (iv)

d)

(iii) and (iv)

95.

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

a)

Reduction as well as combination reactions

b)

Oxidation as well as combination reactions

c)

Reduction as well as displacement reactions

d)

Oxidation as well as displacement reactions

96.

The given chemical reaction represents:

a)

Combination reaction as well as double displacement reaction

b)

Redox reaction as well as displacement reaction

c)

Double displacement reaction as well as redox reaction

d)

Decomposition reaction as well as displacement reaction

97.

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)

Blue to green

b)

Green to blue

c)

Green to brown

d)

Green to yellow

98.

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

a)

Carbondioxide gas

b)

Nitrogen gas

c)

Oxygen gas

d)

Neon gas

99.

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

a)

Distillation of water

b)

Purification of water

c)

Electrolysis of water

d)

Hydrolysis

100.

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

a)

Copper granules

b)

Magnesium ribbon

c)

Sodium pellets

d)

Aluminium dust

101.

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

a)

Double displacement reaction

b)

Displacement reaction

c)

Addition reaction

d)

Decomposition reaction

102.

The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given. The reducing and oxidizing agents involved in this redox reaction are:

a)

Iodine and sulphur respectively

b)

Iodine and hydrogen sulphide respectively

c)

Sulphur and iodine respectively

d)

Hydrogen sulphide and sulphur

103.

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

a)

Iron

b)

Copper

c)

Gold

d)

Silver

104.

Rusting of an iron is an example of

a)

Reduction

b)

Ionization

c)

Oxidation

d)

Dissociation

105.

Combination of phosphorus and oxygen is an example of:

a)

Oxidation

b)

Reduction

c)

Rancidity

d)

None of these

106.

A substance which oxidized itself and reduces other is known as :

a)

Oxidizing agent

b)

Reducing agent

c)

Both of these

d)

None of these

107.

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 reaction

108.

Which information is not conveyed by a balanced chemical equation?

a)

Physical states of reactants and products

b)

Symbols and formulae of all the substances involved in a particular reaction

c)

Number of atoms/molecules of the reactants and products formed

d)

Whether a particular reaction is actually feasible or not

109.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

110.

Both CO2 and H2 gases are

a)

heavier than air

b)

colourless

c)

acidic in nature

d)

soluble in water

111.

What is the molecular formula for barium chloride?

a)

BaCl2

b)

BaCl

c)

Ba2Cl

d)

BaCl3

112.

Balance the following chemical equation:

___NaBr + ___Cl2 ----> ____NaCl + ___Br2

Enter the values serially

(a)  

113.

Reactions in which energy is absorbed are known as (a)   reactions.

114.

Oxidation is the loss of electrons from a substance.

a)

True

b)

False

115.

The digestion of food in the body is an example of (a)   reaction.

116.

Those reactions, in which two compounds react by an exchange of ions to form two new compounds, are called (a)   reactions

117.

A white solid when dropped in water produces a hissing sound. What the solid may be?

(a)  

118.

A magnesium ribbon burns with a dazzling flame in air and changes into a colourless substance, magnesium oxide.

a)

True

b)

False

119.

The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction.

a)

True

b)

False

120.

Unbalanced reactions are also known as (a)  

121.

The number of atoms of each element is not conserved in any chemical reaction.

a)

True

b)

False

122.

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

a)

AgNO3

b)

Ag2S

c)

Ag2O

d)

Ag2CO3

123.

On passing CO₂ gas through the product formed by the reaction between CaO and H₂O, solution becomes which colour?

a)

black

b)

red

c)

pink

d)

white

124.

Which of the following behaviours is true about the solution obtained by mixing CaO with water?

a)

Amphoteric solution

b)

Basic solution

c)

Acidic solution

d)

Neutral solution

125.

Which of the following represents a combination reaction?

a)

Reaction of zinc metal with copper sulphate solution.

b)

Heating of lead nitrate.

c)

.Burning of magnesium in air.

d)

Reaction between silver nitrate and sodium chloride.

126.

While performing an activity in the lab, Meera exhaled air into a colourless solution taken in a test tube. Suddenly its colour turned to milky white. Which among the following is the colourless solution?

a)

Lime water

b)

Soda water

c)

Aqueous solution of NaOH

d)

Aqueous solution of NaCl

127.

An iron nail is placed in a solution of copper sulphate. The nail is taken out after 10 minutes. The nail will be found to be covered with:

a)

Brown deposit

b)

Black deposit

c)

White deposit

d)

Yellow deposit

128.

What happens when a piece of Cu is put into a solution of magnesium chloride?

a)

Cu displaces Mg.

b)

Chlorine gas is liberated

c)

No chemical reaction.

d)

Colour of the solution changes to light green.

129.

Which among the following element changes the color of the knife in this experiment?

a)

Oxygen

b)

Copper

c)

Sulphur

d)

Iron

130.

Which one of the following four metals would be displaced from its salt solution by the other three metals?

a)

Li

b)

Al

c)

Ca

d)

Pt

131.

Hydrated ferrous sulphate is commonly known as ______.

a)

Blue vitriol

b)

Green vitrioll

c)

Yellow vitrio

d)

Brown vitriol

132.

The following picture shows the heating of lead nitrate. On heating two gases are evolved, one is colourless and the other is brown in colour. Which gases are they?

a)

Hydrogen and oxygen

b)

Oxygen and nitrous oxide

c)

Hydrogen and lead oxide

d)

Oxygen and nitrogen dioxide

133.

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)

(a) (i), (ii) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (i), (ii) and (iv)

d)

(d) (ii) and (iv)

134.

Three beakers labelled as A, B and C each containing 25 mL

of water were taken. A small amount of NaOH, anhydrous

CuSO4 and NaCl were added to the beakers A, B and C

respectively. It was observed that there was an increase in

the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the

solution falls. Which one of the following statement(s) is(are) correct?

(i) In beakers A and B, exothermic process has occurred.

(ii) In beakers A and B, endothermic process has occurred.

(iii) In beaker C exothermic process has occurred.

(iv) In beaker C endothermic process has occurred.

a)

(a) (i) only

b)

(b) (ii) only

c)

(c) (i) and (iv)

d)

(d) (ii) and (iii)

135.

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)

(a) (i) and (iv)

b)

(b) (ii) only

c)

(c) (i) and (ii)

d)

(d) (iii) and (iv)

136.

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

137.

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction

a)

(a) (i) only

b)

(b) (ii) only

c)

(c) (iv) only

d)

(d) (ii) and (iv)

138.

Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii) decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

a)

(a) (i) only

b)

(b) (i) and (iii)

c)

(c) (ii) and (iii)

d)

(d) (iv) only

139.
14. Which of the following gases can be used for storage of fresh sample of an oil for a long time?
a)
(a) Carbon dioxide or oxygen
b)
(b) Nitrogen or oxygen
c)
(c) Carbon dioxide or helium
d)
(d) Helium or nitrogen
140.
Potassium Chlorate is heated in presence of catalyst to produce oxygen and potassium chloride.Which of the following statement(s) is(are) correct about the reaction?
a)
(a) It is a decomposition reaction and endothermic in nature
b)
(b) It is a combination reaction
c)
It is a decomposition reaction and accompanied by release of heat
d)
(d) It is a photochemical decomposition reaction and exothermic in nature
141.

Rancidity is a process in which fat/oils smell due to the change process of

a)

oxidation

b)

reduction

c)

displacement

d)

neutralization

142.

Colour of which metal changes to greem due to corrosion?

a)

Cu

b)

Al

c)

Fe

d)

Ag

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