Chemistry 9 Chapter 7 - Electro Chemistry - 1

Chemistry 9 Chapter 7 - Electro Chemistry - 1

1. Which one of the following is an oxidation reduction reaction?

a) Rusting of iron
b) All of these
c) Metabolism of food in humans
d) Forest fire

2. The gain of oxygen atoms is known as?

a) Reduction
b) Hydration
c) Oxidation
d) Condensation

3. The loss of hydrogen atom by an element is known as?

a) Reduction
b) Condensation

c) Hydration

d) Oxidation

4. Oxidation and reduction is the?

a) Loss or gain of protons
b) Loss or gain of neutrons

c) Loss or gain of electrons

d) None

5. C + O₂ ---> CO₂In this reaction, which atoms are oxidized?

a) None of these
b) Oxygen
c) Both of these

d) Carbon

6. In the rusting of iron, the iron is?

a) None
b) Hydrated

c) Oxidized

d) Reduced

7. A process that involves the loss of electrons by an element is known as?

a) Sublimation
b) Oxidation

c) Reduction

d) Evaporation

8. The gain of electrons by a substance is known as?

a) Transpiration

b) Oxidation
c) Reduction

d) Condensation

9. When an element loses electron, it forms?

a) Cation

b) Anion
c) None of these
d) Both of these

10. When sodium loses an electron, it means that it is?

a) Condensed
b) Hydrated

c) Reduced

d) Oxidized

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