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

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

(a) positive carbon electrode?

(b) negative carbon electrode?

Give one example of the chemical effect of electric current.

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.

Name the metal which is usually electroplated on car parts such as bumpers and bicycle handlebars made of steel.