Q10 of 76 Page 270

Give one example of the chemical effect of electric current.

When an electric current is passed through a conducting solution, then chemical reactions take place in the solution. These chemical reactions cause chemical effects in the solution.

Example: When an electric current is passed through water, then water dissociates into hydrogen and oxygen. The chemical reaction is shown below:
 H2O → H+ (aq) + OH- (aq)

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8

When electric current is passed through acidified water, then hydrogen and oxygen are formed. What type of effect of current is illustrated by this statement?

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Acidified water is electrolyzed by using carbon electrodes. What is produced at:

(a) positive carbon electrode?


(b) negative carbon electrode?

 11

What should be done to decompose water into hydrogen and oxygen?

 12

Name the process in which a coating of one metal can be deposited on the surface of another metal by using current from a battery.