Question

In a hydrogen-oxygen fuel cell, combustion of hydrogen
occurs to
(a) produce high purity water
(b) create potential difference between two electrodes
(c) generate heat
(d) remove adsorbed oxygen from elctrode surfaces

Answer 1

produce high purity water

Answer 2

The correct option is' a'

In a hydrogen-oxygen fuel cell,combustion of hydrogen occurs to produce high purity water.

Explanation:

Hydrogen gas is made up of 2 hydrogen atom that are connected by covalent bond.

When hydrogen combustion takes place in a hydrogen oxygen fuel cell, the hydrogen reacts with the oxygen gas as the heat causes broken down of bonds between hydrogen and it make bond with the oxygen atom and thus produce water and energy.This combustion will produce 286,000 joules of energy.

The chemical reaction which occur  between hydrogen and oxygen is-

$H_{2} +\frac{1}{2} O_{2} =2H_{2} O$$+286,OOO$ joules energy.