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CHEMICAL REACTIONS & EQUATIONS

Total questions: 125

Worksheet time: 1hrs 24mins

Name
Class
Date
1.

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

2.

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

3.

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)  

4.

What is the formula of magnesium nitride?

a)

MgN3

b)

Mg2N3

c)

Mg3N2

d)

Mg2N

5.

What are the products of decomposition of PbCO3

a)

PbO + CO2

b)

Pb + CO2 + O2

c)

PbO + C

d)

Pb + C + O2

6.

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

7.

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

8.

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

9.

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

10.

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

11.

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

12.

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

13.

(a)   of electrons is oxidation.

14.

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

a)

1:1

b)

2:1

c)

1:2

d)

4:1

15.

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

16.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

17.

Rusting of iron is a physical change.

a)

True

b)

False

18.

CaO + H2O --> Ca(OH)2

This is an example of

a)

Combination reaction

b)

Decomposition reaction

c)

Displacement reaction

d)

None of the above

19.

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

20.

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.

21.

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.

22.

Corrosion of iron is known as (a)   .

23.
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)
24.
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)
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)
(i), (ii) and (iii)
b)
(iii) and (iv)
c)
(i), (ii) and (iv)
d)
(ii) and (iv)
26.
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)
27.
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)
28.
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
29.
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)
30.
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
31.
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
32.
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
33.
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)
34.
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)
35.

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

a)

oxidation

b)

reduction

c)

displacement

d)

neutralization

36.

Colour of which metal changes to greem due to corrosion?

a)

Cu

b)

Al

c)

Fe

d)

Ag

37.

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)

38.

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

39.

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

40.

What is the formula of magnesium nitride?

a)

MgN3

b)

Mg2N3

c)

Mg3N2

d)

Mg2N

41.

What are the products of decomposition of PbCO3

a)

PbO + CO2

b)

Pb + CO2 + O2

c)

PbO + C

d)

Pb + C + O2

42.

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

43.

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

44.

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

45.

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

46.

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

a)

Displacement reaction

b)

Double displacement reaction

c)

Addition reaction

d)

Decomposition reaction

47.

Name the product formed when CaO reacts with water

a)

Calcium hydroxide

b)

CO2 + Ca

c)

Ca+ H2O

48.

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

49.

Balance

BaCl2 +H2SO4 = BaSO4 +HCl

4 lines
50.

When CaCO2 is heated the products are

a)

CaO + CO2

b)

CaOH2

c)

Ca+ H2O

51.

2Cu +O2 =2 CuO when heated.

Name the reaction

a)

Reduction

b)

Oxidation

c)

Redox reaction

d)

Exothermic

52.

Chemical formula of quick lime is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

53.

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

54.

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

55.

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

56.

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

57.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

58.

Those reactions in which one element takes the place of another element in a compound, are known as displacement reactions.

Example: CuSO4 (aq) + Zn (s) —–>ZnSO4 + Cu

a)

displacement reaction,

b)

double displacement reaction

59.

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.

Example: AgNO3 (aq) + NaCl (aq)

a)

displacement reaction,

b)

double displacement reaction

60.
AgNO3
a)
Silver Nitrate
b)
Silver (I) Nitrate
c)
Silver Nitride
d)
Silver Nitrogen Trioxide
61.

Which method is used to prepare silver chloride?

a)

Add excess solid reactant to acid

b)

Titration

c)

Precipitation

62.

Which is the most suitable method for separating the products of the reaction below:

When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed along with sodium nitrate solution. In this reaction, two compounds, silver nitrate and sodium chloride, react to form two new compounds, silver chloride and sodium nitrate.

NaCl (aq) + AgNO3 (aq) --> AgCl (s) + NaNO3 (aq)

a)

chromatography

b)

crystallisation

c)

distillation

d)

filtration

63.

NaCl (aq) + AgNO3 (aq) --> AgCl (s) + NaNO3 (aq).

When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed along with sodium nitrate solution. In this reaction, two compounds, silver nitrate and sodium chloride, react to form two new compounds, silver chloride and sodium nitrate. Which method is used to prepare silver chloride?

a)

Add excess solid reactant to acid

b)

Titration

c)

Precipitation

64.

Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions. What is the first statement of the audio clip?

a)

Those reactions in which a compound splits up into two or more simpler substances are known as decomposition reactions.

b)

Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

c)

They are called opposite of combination reactions because in a combination reaction, two or more substances combine to form a single substance.

d)

Example: Magnesium and oxygen combine, when heated, to form magnesium oxide.

65.

Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions. What is the second statement of the audio clip?

a)

Those reactions in which a compound splits up into two or more simpler substances are known as decomposition reactions.

b)

Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

c)

They are called opposite of combination reactions because in a combination reaction, two or more substances combine to form a single substance.

d)

Example: Magnesium and oxygen combine, when heated, to form magnesium oxide.

66.

Why are decomposition reactions called the opposite of combination reactions? Explain with equations of these reactions. What is the third statement of the audio clip?

a)

Those reactions in which a compound splits up into two or more simpler substances are known as decomposition reactions.

b)

Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

c)

They are called opposite of combination reactions because in a combination reaction, two or more substances combine to form a single substance.

d)

Example: Magnesium and oxygen combine, when heated, to form magnesium oxide.

67.

Why are decomposition reactions called the opposite of combination reactions? Explain with equations of these reactions. What is the fourth statement of the audio clip?

a)

Those reactions in which a compound splits up into two or more simpler substances are known as decomposition reactions.

b)

Example: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

c)

They are called opposite of combination reactions because in a combination reaction, two or more substances combine to form a single substance.

d)

Example: Magnesium and oxygen combine, when heated, to form magnesium oxide.

68.

Express the following facts in the form of a balanced chemical equation: "When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed”.

a)

Cu (s) + 2AgNO3 (aq)—–>Cu(NO3)2 (aq) + 2Ag (s)

b)

2AgNO3→2Ag+2NO2​+O2​

c)

Zn+2AgNO3→Zn(NO3​)2​+2Ag

69.

What happens when a piece of iron metal is placed in copper sulphate solution ? Name the type of reaction involved.

a)

When a piece of iron metal is placed in copper sulphate solution, then magnesium sulphate solution and copper metal are formed. This is a type of displacement reaction.

b)

When a piece of iron metal is placed in copper sulphate solution, then ferrous sulphate solution and copper metal are formed. This is a type of displacement reaction.

c)

Fe + CuSO₄ = FeSO₄ + Cu (iron displaces copper in the salt solution; the iron dissolves, turning into solution, and metallic copper of a reddish color is released).

70.

What happens when a piece of iron metal is placed in copper sulphate solution ? Write a well balanced equation for the reaction

a)

When a piece of iron metal is placed in copper sulphate solution, then magnesium sulphate solution and copper metal are formed. This is a type of displacement reaction.

b)

When a piece of iron metal is placed in copper sulphate solution, then ferrous sulphate solution and copper metal are formed. This is a type of displacement reaction.

c)

Fe + CuSO₄ = FeSO₄ + Cu (iron displaces copper in the salt solution; the iron dissolves, turning into solution, and metallic copper of a reddish color is released).

d)

2AgNO3 → 2Ag + 2NO2 + O2

e)

Pb(NO3)2 + Fe2(SO4)3 → Fe(NO3)3 + PbSO4

71.

In the reaction represented by the following equation :CuO(s) + H2(g) ————- > Cu (s) + H20(1)

name the substance oxidised

a)

H2

b)

CuO

c)

CuO

d)

H2

72.

In the reaction represented by the following equation :

CuO(s) + H2(g) ————- > Cu (s) + H20(1)

name the substance reduced

a)

H2

b)

CuO

c)

Cu

d)

H2

73.

In the reaction represented by the following equation :

CuO(s) + H2(g) ————- > Cu (s) + H20(1)

name the oxidising agent

a)

H2

b)

CuO

c)

Cu

d)

H2

74.

In the reaction represented by the following equation :

CuO(s) + H2(g) ————- > Cu (s) + H20(1)

name the reducing agent

a)

H2

b)

CuO

c)

Cu

d)

H2

75.

What happens when silver nitrate solution is added to sodium chloride solution ?

a)

When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed along with sodium nitrate solution.

b)

AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq). This is a precipitation reaction: AgCl is the formed precipitate. ; Colorless to slightly yellow gas with a pungent, irritating odor.

c)

Ag+ + Cl- → AgCl (s)

76.

What happens when silver nitrate solution is added to sodium chloride solution ?(a) Write the equation for the reaction which takes place.

a)

AgNO3(aq) + NaCl (aq)

b)

AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq). This is a precipitation reaction: AgCl is the formed precipitate. ; Colorless to slightly yellow gas with a pungent, irritating odor.

c)

Ag+ + Cl- → AgCl (s)

77.

What happens when silver nitrate solution is added to sodium chloride solution? Name the type of reaction involved

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Combination Reaction

d)

Precipitation Reaction.

e)

Decomposition Reaction.

78.

Decomposition Reaction. What is the first statement of the video clip?

a)

Decomposition Reactions:

the reaction in which a single compound

breaks up into two or more simple substances is known as

reactions

b)

The decomposition reaction generally takes place when energy in some form such as heat, electricity or light is

supplied to the reactants

c)

CaCO3(s)+heat (when heated) → CaO(s) + CO2(g)

d)

decomposition of a substance by heating is thermal decomposition

e)

Electrolysis: the decomposition of a substance by passing electric current through it is

known as electrolysis

79.

Decomposition Reaction. What is the second statement of the video clip?

a)

2 NaCl(l) (electrolysis) ---> 2 Na(l) + Cl2(g)

Sodium chloride on passing electric current gives sodium 2na and chlorine cl2

b)

The decomposition reaction generally takes place when energy in some form such as heat, electricity or light is

supplied to the reactants

c)

CaCO3(s)+heat (when heated) → CaO(s) + CO2(g)

d)

decomposition of a substance by heating is thermal decomposition

e)

Electrolysis: the decomposition of a substance by passing electric current through it is

known as electrolysis

80.

Decomposition Reaction. What is the third statement of the video clip?

a)

2 NaCl(l) (electrolysis) ---> 2 Na(l) + Cl2(g)

Sodium chloride on passing electric current gives sodium 2na and chlorine cl2

b)

Photolysis: the decomposition of a compound with light is called photolysis

c)

CaCO3(s)+heat (when heated) → CaO(s) + CO2(g)

d)

decomposition of a substance by heating is thermal decomposition

e)

Electrolysis: the decomposition of a substance by passing electric current through it is

known as electrolysis

81.

Decomposition Reaction. What is the fourth statement of the video clip?

a)

2 NaCl(l) (electrolysis) ---> 2 Na(l) + Cl2(g)

Sodium chloride on passing electric current gives sodium 2na and chlorine cl2

b)

Photolysis: the decomposition of a compound with light is called photolysis

c)

study of decomposition of silver chloride: take about 2 grams of silver chloride in

a china dish

d)

decomposition of a substance by heating is thermal decomposition

e)

Electrolysis: the decomposition of a substance by passing electric current through it is

known as electrolysis

82.

Decomposition Reaction. What is the fifth statement of the video clip?

a)

2 NaCl(l) (electrolysis) ---> 2 Na(l) + Cl2(g)

Sodium chloride on passing electric current gives sodium 2na and chlorine cl2

b)

Photolysis: the decomposition of a compound with light is called photolysis

c)

study of decomposition of silver chloride: take about 2 grams of silver chloride in

a china dish

d)

place this china dish in the sunlight for sometime

e)

Electrolysis: the decomposition of a substance by passing electric current through it is

known as electrolysis

83.

Decomposition Reaction. What is the sixth statement of the video clip?

a)

2 NaCl(l) (electrolysis) ---> 2 Na(l) + Cl2(g)

Sodium chloride on passing electric current gives sodium 2na and chlorine cl2

b)

Photolysis: the decomposition of a compound with light is called photolysis

c)

study of decomposition of silver chloride: take about 2 grams of silver chloride in

a china dish

d)

place this china dish in the sunlight for sometime

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

84.

Decomposition Reaction. What is the seventh statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

Photolysis: the decomposition of a compound with light is called photolysis

c)

study of decomposition of silver chloride: take about 2 grams of silver chloride in

a china dish

d)

place this china dish in the sunlight for sometime

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

85.

Decomposition Reaction. What is the eighth statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

study of decomposition of silver chloride: take about 2 grams of silver chloride in

a china dish

d)

place this china dish in the sunlight for sometime

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

86.

Decomposition Reaction. What is the ninth statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

2AgBr (when exposed to light) ----> 2Ag +Br2

d)

place this china dish in the sunlight for sometime

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

87.

Decomposition Reaction. What is the tenth statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

2AgBr (when exposed to light) ----> 2Ag +Br2

d)

the above reactions are used in black and white photography

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

88.

Decomposition Reaction. What is the eleventh statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

2AgBr (when exposed to light) ----> 2Ag +Br2

d)

the above reactions are used in black and white photography

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

89.

Decomposition Reaction. What is the Twelfth statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

2AgBr (when exposed to light) ----> 2Ag +Br2

d)

the above reactions are used in black and white photography

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

90.

Decomposition Reaction. What is the Thirteenth statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

2AgBr (when exposed to light) ----> 2Ag +Br2

d)

the above reactions are used in black and white photography

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

91.

Decomposition Reaction. What is the Fourteenth statement of the video clip?

a)

2AgCl (on exposure to sunlight) ---- 2Ag +Cl2

b)

silver bromide undergoes decomposition when exposed to light

c)

2AgBr (when exposed to light) ----> 2Ag +Br2

d)

the above reactions are used in black and white photography

e)

it is observed that the white silver chloride turns gray on exposure to sunlight

92.

What is corrosion?

a)

The release of oxygen

b)

Breakdown of a metal

93.

Iron rust in the presence of:

a)

Oxygen

b)

Vacuum

c)

Moisture

d)

Moisture and Oxygen

94.

Is this an example of corrosion?

a)

Yes

b)

No

95.

Deterioration of metal due to the corrosive environment

a)

Erosion

b)

Corrosion

c)

Both A & B

d)

None of these

96.

Corrosion of Metals involves

a)

Physical reactions

b)

chemical reactions

c)

Both

d)

None

97.

Define metal corrosion.

a)

Deterioration of metal by chemical or electrochemical attack that can occur internally & externally.

b)

Changes smooth surface.

c)

weakens interior, damages and/or loosens adjacent parts.

d)

All are correct.

98.

Explain the corrosion process.

a)

Metal that is oxidized (loss of electron) suffers anodic change.

b)

Corrosive agent reduced (gain of electron) undergoes cathodic change.

c)

Both are correct.

99.

Whats is corrosion?


Please select CORRECT answer.

a)

Elecctrochemical process in which metals are eaten up gradually by the action of air, moisture or a chemical (such as an acid) on their surface.

b)

The process of eroding or being eroded by wind, water, or other natural agents

100.

Which metals rusts?

a)

Copper

b)

manganese

c)

iron

d)

potassium

101.

What environmental element assists rusting?

a)

nitrogen

b)

oxygen

c)

carbon

d)

hydrogen

102.

What conditions are required for rusting?

a)

dry cold conditions

b)

dry hot conditions

c)

hot damp conditions

103.

What is the chemical name given to Rust ?

a)

Iron dioxide

b)

Iron oxide

c)

Steel oxide

d)

Carbon dioxide

104.

What prevents Rusting

a)

Painting , Oiling , Galvinising

b)

Washing with water

105.

What is the chemical name given to Rust ?

a)

hydrated iron(I) oxide

b)

Iron (I) oxide

c)

iron(II) hydroxide

d)

hydrated iron(III) oxide

106.

Which of the following does not prevent rusting of iron?

a)

Painting , Oiling , Galvinising

b)

Attach to a piece of copper

c)

connect to a piece of magnesium with wire

d)

cover entirely with copper

107.

In which tube will the nail go rusty?

a)

The nail in tube A will go rusty.

b)

The nail in tube B will go rusty.

c)

The nail in tube C will go rusty.

108.

A rusting bicycle

a)

physical change

b)

chemical change

109.

Rusting is an example of

a)

oxidation

b)

reduction

110.

What two things cause Iron to Rust ?

a)

Air and Oxygen

b)

Water and Carbon dioxide

c)

Oxygen and Water

d)

Carbon dioxide and Air

111.

A layer of reddish brown on surface of a metal is called...

a)

red paint

b)

red dirt

c)

rust

d)

brown rust

112.

Choose an object that can rust.

a)

Iron spoon

b)

Straw

c)

String

d)

Aluminium pot

113.

Which of the following groups consist of rusty objects?

a)

Nail, key, board and marble

b)

Nail, marble. needle and screw

c)

Nail, key, needle and screw

d)

Marble. rubber band and clothes

114.

Two factors that cause rusting are the presence of ......... and ...........

a)

oxygen

b)

water

c)

hydrogen

d)

carbon dioxide

115.

Which of the following can rust?

a)
b)
c)
d)
116.

Choose the correct characteristics of rusty objects.

a)

Strong

b)

Stiff

c)

Rough surface

d)

Brittle

e)

Looks new

117.

Only objects that are made from iron and steel will rust.

a)

TRUE

b)

FALSE

118.

Why wooden bench do not rust?

a)

because it is made of plastic.

b)

because it is made of wood.

c)

because it is made of iron.

119.
a)

Can rust

b)

Does not rust

120.

9.An experiment has been carried out by a group of pupils. The results of the

experiment are recorded in Table 2.

What can be concluded from this experiment?

a)

Nail X did not rust because exposed to the air and water.

b)

Nail Y rusts because exposed to the air and water

c)

Nail X did not rust because exposed to the oil layer.

d)

Nail Z did not rust because exposed to water.

121.

6.Table shows the results of an investigation

by a group of Year 5 Zircon pupils.

What is the conclusion that can be made

from the results of this investigation?

a)

Rusty objects are made of iron.

b)

Non-rusty objects are made of iron.

c)

Rusty objects are brownish colour.

d)

Rusty objects are made of plants.

122.

Which nail rusts first?

a)

Nail in test tube A

b)

Nail in test tube C

c)

Nail in test tube E

d)

Nail in test tube F

123.

How do you prevent this food can from rusting?

a)

painting

b)

apply oil or grease

c)

coating with plastic

d)

plating with non rusty metal

124.

An investigation was carried out by year 5 pupils to study the factors that cause rusting. What is the function of anhydrous calcium chloride in this investigation?

a)

To protect the iron nail

b)

To increase the rate of the rusting process

c)

To absorb the moisture in the air

d)

To supply oxygen in the test tube

125.

Which of the following methods can prevent rusting?

a)

applying grease on objects made from iron

b)

painting steel objects

c)

cover steel and iron objects with a damp cloth

d)

cover steel objects with non-rusty material

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