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Chemical Reactions & Equations Quiz-a

Total questions: 80

Worksheet time: 55mins

Name
Class
Date
1.

What is a combination reaction?

a)

A reaction where one reactant is replaced by another

b)

A reaction where two or more reactants combine to form a compound

c)

A reaction that releases energy

d)

A reaction that absorbs energy

2.

What is another name for a combination reaction?

a)

Decomposition reaction

b)

Displacement reaction

c)

Synthesis reaction

d)

Neutralization reaction

3.

What happens in a thermal decomposition reaction?

a)

Heat is applied to decompose a reactant

b)

Heat is absorbed to form a compound

c)

A solid is formed from a liquid

d)

A gas is produced without heat

4.

What is produced when mercury (II) oxide is heated?

a)

Oxygen and hydrogen

b)

Mercury and carbon dioxide

c)

Mercury and oxygen

d)

Mercury and nitrogen

5.

What type of reaction occurs when iron displaces hydrogen from hydrochloric acid?

a)

Combination reaction

b)

Double displacement reaction

c)

Decomposition reaction

d)

Single displacement reaction

6.

What is the result of mixing silver nitrate with distilled water?

a)

No reaction occurs

b)

A solid precipitate forms

c)

A gas is released

d)

A color change occurs

7.

What is a combustion reaction?

a)

A reaction that occurs in a vacuum

b)

A reaction that produces a solid

c)

A reaction between a fuel and oxygen

d)

A reaction that absorbs heat

8.

What does the rate of a chemical reaction refer to?

a)

The pressure of the reaction

b)

The temperature of the reactants

c)

The speed at which a reaction occurs

d)

The amount of product formed

9.

What is the role of a catalyst in a chemical reaction?

a)

To increase the rate of the reaction

b)

To change the products formed

c)

To slow down the reaction

d)

To increase the temperature

10.

What is an exothermic reaction?

a)

A reaction that releases heat

b)

A reaction that absorbs heat

c)

A reaction that requires a catalyst

d)

A reaction that occurs at high pressure

11.

Which of the following is an example of a reversible reaction?

a)

Photosynthesis

b)

Burning of wood

c)

Combustion of gasoline

d)

Rusting of iron

12.

What is the effect of increasing temperature on the rate of a reaction?

a)

It stops the reaction

b)

It increases the rate

c)

It has no effect

d)

It decreases the rate

13.

(a)   of electrons is oxidation.

14.

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

15.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

16.

Rusting of iron is a physical change.

a)

True

b)

False

17.

CaO + H2O --> Ca(OH)2

This is an example of

a)

Combination reaction

b)

Decomposition reaction

c)

Displacement reaction

d)

None of the above

18.

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

19.

Assertion: AgBr is used on photographic and X – ray film.

Reason: AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

a)

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

b)

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

c)

Assertion is true but the reason is false.

d)

The statement of the Assertion is false but the Reason is true.

20.

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

Reason: Zinc reacts with oxygen to form zinc oxide.

a)

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

b)

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

c)

Assertion is true but the reason is false.

d)

The statement of the Assertion is false but the Reason is true.

21.

Corrosion of iron is known as (a)   .

22.

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

23.

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

24.

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)

25.

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)

26.

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

27.

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

28.

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

29.

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

30.

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

31.
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)
32.

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

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

33.

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

34.

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

35.
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
36.
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)
37.

Chemical formula of quick lime is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

38.

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

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

39.

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

40.

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

41.

Which of the following is not a chemical reaction ?

a)

Formation of salt solution

b)

Milk turns sour in hot weather

c)

Burning of match stick

d)

Contamination of food

42.

An unbalanced chemical equation is written in :

a)

Simple form

b)

Proper form

c)

Unorganized form

d)

Skeletal form

43.

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

44.

Which of the following gases can be used for storage of fresh sampel of an oil for a long time?

a)

Carbon dioxide or oxygen

b)

Nitrogen or helium

c)

Helium or oxygen

d)

Nitrogen or oxygen

45.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

46.

Which of the following reactions involves the combination of two elements :-

a)

CaO + CO2 -> CaCO3

b)

4Na + O2 -> 2Na2O

c)

SO2 +(1/2)O2 -> SO3

d)

NH3 + HCI -> NH4CI

47.

3.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

48.

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

49.

In the following equation:

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

a)

1

b)

2

c)

3

d)

4

50.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

51.

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

a)

Fe

b)

Cu

c)

Au

d)

Ag

52.

Black and white photography uses

a)

Decomposition of silver chloride

b)

Decomposition of silver bromide

c)

Both

d)

None of these

53.

Rusting of an iron is an example of :

a)

Reduction

b)

Ionization

c)

Oxidation

d)

Dissociation

54.

A redox reaction is one in which :

a)

Both the substance are reduced

b)

Both the substance are oxidized

c)

An acid is neutralized by the base

d)

One substance is oxidized while the other is reduced

55.

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

56.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

57.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

58.

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)

59.

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

60.

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

61.

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)  

62.

What is the formula of magnesium nitride?

a)

MgN3

b)

Mg2N3

c)

Mg3N2

d)

Mg2N

63.

What are the products of decomposition of PbCO3

a)

PbO + CO2

b)

Pb + CO2 + O2

c)

PbO + C

d)

Pb + C + O2

64.

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

65.

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

66.

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

67.

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

68.

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

69.

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

70.

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

71.

In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitate formed is ----

a)

HCl

b)

Chlorine

c)

Sulphur

d)

Barium sulphate

72.

The respiration process in which glucose reacts with oxygen to produce energy is

a)

Exothermic reaction

b)

Endothermic reaction

c)

Reversible reaction

d)

Combination reaction

73.

Neutralisation reaction between an acid and base is a type of----

a)

Displacement reaction

b)

Double displacement reaction

c)

Addition reaction

d)

Decomposition reaction

74.

2 PbO + C = 2 Pb+ CO2

a)

Redox reaction

b)

Decomposition reaction

c)

Oxidation reaction

d)

Displacement reaction

75.

Name the product formed when CaO reacts with water

a)

Calcium hydroxide

b)

CO2 + Ca

c)

Ca+ H2O

76.

Write balanced chemical reaction-

Sodium+ water = Sodium hydroxide + Hydrogen

4 lines
77.

Why does Silver chloride turn grey in sunlight ?

a)

Due to corrosion

b)

Due to the formation Ag and Cl

c)

Due to the formation of silver hydroxide

78.

Balance

BaCl2 +H2SO4 = BaSO4 +HCl

4 lines
79.

When CaCO2 is heated the products are

a)

CaO + CO2

b)

CaOH2

c)

Ca+ H2O

80.

2Cu +O2 =2 CuO when heated.

Name the reaction

a)

Reduction

b)

Oxidation

c)

Redox reaction

d)

Exothermic

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