First slide

Electrolysis

Question

The products of electrolysis of aqueous NaCl solution are

Easy

A

Na at cathode and Cl₂ at anode
B

H₂ at cathode and Cl₂ at anode
C

H₂ at cathode and O₂ at anode
D

Na at cathode and O₂ at anode

Solution

$2NaCl \rightleftharpoons 2N{a^ + } + 2C{l^ - }$
At cathode;
Discharge potential of H₂O is less than Na⁺ or SRP of H₂O is greater than Na⁺.H₂O is preferentially reduced.
$2{H_2}O + 2{e^ - } \rightleftharpoons {H_2} + 2O{H^ - }$
At Anode :
Discharge potential of H₂O is less than Cl^- or SOP of H₂O is greater than Cl^-.Cl^- is preferentially Oxidised.
$2C{l^ - } \rightleftharpoons C{l_2} + 2{e^ - }$
Note: If the electrolyte is very dilute insted of Cl₂ at anode O₂ is liberated at anode.

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