Chemical Reactions Test

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Chemical Reactions Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a chemical change?

A
Melting of ice

B
Burning of sulphur

C
Melting of wax

D
Magnetisation of iron

Solution

Chemical change is any change that results in the formation of a new chemical substance. Burning of sulphur is a chemical change as it reacts with oxygen to form sulphur dioxide gas.

S(s) + O₂(g) –--> SO₂(g)
Question 2
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What will happen if temperature of 1 kg of water is raised from 30^o to 140^oC?

I. There will be a change in the physical state of the substance.
II. It goes through a chemical change.
III. All the heat supplied does not contribute to the temperature rise.
IV. The boiling point of water will depend on the atmospheric pressure.

A
I and II

B
I, III and IV

C
II, III and IV

D
II and III

Solution

When the temperature of 1 kg of water is raised from 30^oC to 140^oC, a physical change of state occurs and water vapourizes to steam.
The change of state requires latent heat of vapourization.

Also, the boiling point of water is directly proportional the atmospheric pressure.
Question 3
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Chemical change does not take place in case of

A
souring of milk into curd

B
burning of magnesium ribbon in air

C
emitting of light by a red hot platinum wire

D
rusting of iron in atmosphere

Solution

Chemical change does not take place in case of emission of light by a red hot platinum wire.Platinum is a noble metal and does not get oxidised on burning in the air.

On heating, it becomes red hot, but does not get oxidised.
Question 4
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Which of the following represents a chemical change?

A
Evaporation of water

B
Sublimation of iodine

C
Heating a platinum wire in Bunsen flame

D
Heating of FeS powder

Solution

Heating of iron sulphide powder represents a chemical change.
Chemical change is any change that results in the formation of new chemical substances.

Heating of iron sulphide in air is a chemical change.
FeS(s) + O₂(g) → Fe(s) + SO₂(g)
Question 5
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Which of the following processes causes a chemical change?

A
Distillation

B
Filtration

C
Oxidation

D
Evaporation

Solution

A chemical change involves the creation of a new substance from two or more reactants. After a chemical change occurs, the new substance, called a product, has a different chemical composition than the original materials.

Oxidation is one example of a chemical change. The substance is oxidised by a loss of electrons and forms a new substance.
Question 6
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What is generally affected in a chemical change?

A
Nucleus

B
Electron

C
Neutron

D
Proton

Solution

Chemical changes are generally brought about by the transfer or sharing of the electrons. The electrons of the valence shell participate in the chemical reactions.
Question 7
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Which of the following is a reduction reaction?

A
Fe²⁺ → Fe³⁺ + e^–

B
2I^-– 2e^– → I₂

C
Sn²⁺ → Sn⁴⁺ + 2e^–

D
Cu²⁺ → Cu^o – 2e^–

Solution

Cu²⁺ → Cu^o – 2e^– is a reduction reaction because oxidation state changes from + 2 to 0.
Question 8
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In the ordinary fire extinguisher, carbon dioxide is generated by the reaction of

A
marble powder and dilute HCI

B
limestone and dilute H₂SO₄

C
sodium bicarbonate and dilute H₂SO₄

D
magnetite and dilute HCI

Solution

In an ordinary fire extinguisher, carbon dioxide is generated by the reaction of sodium bicarbonate and dilute H₂SO₄.

The reaction occuring is a neutralization reaction and the large volumes of CO₂ evolved envelop the burning substance and cut off the supply of oxygen. The water produced helps to bring down the temperature of the burning substance below the ignition temperature and therefore puts out the fire.
Question 9
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When a small amount of manganese dioxide is added to hydrogen peroxide, oxygen is evolved. This is an example of

A
reduction

B
oxidation

C
double decomposition

D
decomposition

Solution

When a small amount of manganese dioxide is added to hydrogen peroxide, oxygen is evolved.
This is an example of a decomposition reaction.

H₂O₂ decomposes to H₂O and O₂; MnO₂ acts a catalyst in the reaction.
Question 10
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Which of the following is an example of photolysis reaction?

A
Fe + S → FeS

B
PCl₃ + Cl₂ → PCl₅

C
CaO + CO₂ → CaCO₃

D
2AgBr → 2Ag + Br₂

Solution

Photolysis is a decomposition chemical reaction brought about by utilizing light energy.

For example:

2AgBr → Ag + Br₂.

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Chemical Reactions Test - 3

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Question 1

Melting of ice

Burning of sulphur

Melting of wax

Magnetisation of iron

Solution

Question 2

I and II

I, III and IV

II, III and IV

II and III

Solution

Question 3

souring of milk into curd

burning of magnesium ribbon in air

emitting of light by a red hot platinum wire

rusting of iron in atmosphere

Solution

Question 4

Evaporation of water

Sublimation of iodine

Heating a platinum wire in Bunsen flame

Heating of FeS powder

Solution

Question 5

Distillation

Filtration

Oxidation

Evaporation

Solution

Question 6

Nucleus

Electron

Neutron

Proton

Solution

Question 7

Fe2+ → Fe3+ + e–

2I- – 2e– → I2

Sn2+ → Sn4+ + 2e–

Cu2+ → Cuo – 2e–

Solution

Question 8

marble powder and dilute HCI

limestone and dilute H2SO4

sodium bicarbonate and dilute H2SO4

magnetite and dilute HCI

Solution

Question 9

reduction

oxidation

double decomposition

decomposition

Solution

Question 10

Fe + S → FeS

PCl3 + Cl2 → PCl5

CaO + CO2 → CaCO3

2AgBr → 2Ag + Br2

Solution

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Fe²⁺ → Fe³⁺ + e^–

2I^-– 2e^– → I₂

Sn²⁺ → Sn⁴⁺ + 2e^–

Cu²⁺ → Cu^o – 2e^–

limestone and dilute H₂SO₄

sodium bicarbonate and dilute H₂SO₄

PCl₃ + Cl₂ → PCl₅

CaO + CO₂ → CaCO₃

2AgBr → 2Ag + Br₂