When sodium chloride solution is electrolysed. the gas that is liberated at the cathode is

When sodium chloride solution is electrolysed. the gas that is liberated at the cathode is

A
Oxygen
B
Hydrogen
C
Chlorine
D
Air

Solution:

$2 NaCl + 2 H_{2} O \overset{Electrolysis}{\to} 2 NaOH + \underset{Anode}{{Cl}_{2}} + \underset{Cothode}{H_{2}}$

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