Chemistry - 9 Chapter - 8Electro Chemistry Test - 8

Chemistry - 9 Chapter - 8
Electro Chemistry
Test - 8

1. What reaction is used by an electrochemical cell to produce electric current?

a) Oxidation-reduction
b) Reduction
c) Oxidation
d) None is correct

2. What is oxidation?

a) Oxidation is a chemical reaction in which oxygen is added or hydrogen is removed or electrons are lost.
b) Oxidation is an electrical reaction in which oxygen is added or hydrogen is removed or electrons are lost.

3. What is reduction?

a) Reduction is a chemical reaction in which hydrogen is added or oxygen is removed or electrons are absorbed.
b) Reduction is an electrical reaction in which hydrogen is added or oxygen is removed or electrons are absorbed.

4. What is zinc?

a) A bluish-white metal that is used as a coating for steel and iron etc.
b) A redish-white metal that is used as a coating for steel and iron etc.

5. What is carbon?

a) A metallic element that exists as, diamond and graphite. It is used for making electrodes or a lamp filament etc.
b) A nonmetallic element that exists as, diamond and graphite. It is used for making electrodes or a lamp filament etc.

6. Dry cell which we use in daily life is Zinc - Carbon Dry Cell.

a) False
b) True

7. In a Zinc - Carbon Dry Cell zinc container is filled with?

a) MnO^2 and powdered carbon
b) Magnese dioxide
c) All are correct
d) Most mixture of ammonium chloride, NH₄CL

8. In a Zinc - Carbon Dry Cell a graphite rod, placed at the centre of this paste, acts as?

a) Electrode
b) Anode
c) Cathode

9. A Zinc - Carbon Dry Cell can be recharged.

a) True
b) False

10. Why a Zinc - Carbon Dry Cell cannot be recharged?

a) Because the electrodes and electrolytes can be brought back into their original condition.
b) Because the electrodes and electrolytes cannot be brought back into their original condition.

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