Question

When water is electrolysed, gas collected at cathode is ___.

• A. Oxygen
• B. Deuterium
• C. Ozone
• D. Hydrogen

Answer 1

The correct option is D Hydrogen

$Atcathode:Hydrogenisproduced$
$2H^{+}\left(aq\right)+2e^{-}\to H_2$
$Atanode:Oxygenisproduced$
$4O{H}^{-}\left(aq\right)\to 2H_{2}O+O_2+4e^{-}$