Question

When electricity is passed through water-
(a) hydrogen is evolved at anode
(b) oxygen gas is evolved at cathode
(c) hydrogen is evolved at cathode
(d) no change occurs

Answer 1

Answer:

answer is (a)

Explanation:

hydrogen is evolved at anode

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Answer 2

The right answer to the asked question is Option C.

When electricity is passed through water, hydrogen is evolved at cathode.  Water molecule is formed by two elements i.e., one negative Oxygen ion and two positive Hydrogen ions.

There is electromagnetic attraction between the two ions. Therefore, the water molecules are held together. However, when electricity is passed through water via two electrodes, a cathode and an anode, the former is negative and the latter is positive electrode.  The ions are attracted in the direction of the oppositely charged electrode.