Chemistry - 9 Chapter - 8Electro Chemistry Test - 10

Chemistry - 9 Chapter - 8
Electro Chemistry
Test - 10

1. Why Lead storage battery is recharged by provision of external potential (charge)? Short..Answer…….Remember.by.Heart………………….
The sulphuric acid, which had been consumed while the battery was in use, is regenerated.

a) The sulphuric acid, which had been consumed while the battery was in use, is cleaned.
b) The sulphuric acid, which had been consumed while the battery was in use, is regenerated.

2. What is electroplating?

a) The process of coating the surface of a metal with another metal with the help of electricity.
b) The process of coating the surface of a metal with another non-metal with the help of electricity.

3. What are main objectives of electroplating?

a) All are correct
b) Protection
c) Repair
d) Decoration

4. How decoration is achieved by electroplating? Short..Answer…….Remember.by.Heart………………….
Decoration is achieved by depositing the noble metals like gold and silver on the inferior metals to enhance their beauty.

a) Decoration is achieved by depositing the noble metals like gold and silver on the inferior metals to enhance their strength.
b) Decoration is achieved by depositing the noble metals like gold and silver on the inferior metals to enhance their beauty.

5. How protection is achieved by electroplating?

a) Protection is achieved by saving metals from rusting as well as from the reaction of non organic acids.
b) Protection is achieved by saving metals from rusting as well as from the reaction of organic acids.

6. How repair is achieved by electroplating?

a) By welding the broken parts of the machinery by electro-deposition of non metals.
b) By welding the broken parts of the machinery by electro-deposition of metals.

7. The electrolyte is a salt of the metal being deposited.

a) False
b) True

8. The article to be electroplated is made a cathode.

a) True
b) False

9. The metal to be deposited on article is made anode.

a) False
b) True

10. What properties should be possessed by the electrolyte chosen for electroplating? ( Pick the wrong statement )

a) not easily oxidized or reduced or hydrolysed
b) very soluble in water
c) must have a shining colour
d) good conductor
e) not easily oxidized or reduced or hydrolysed

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