First slide

Electrolysis

Question

The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are

Easy

A

Na and Br₂
B

Na and O₂
C

H₂, Br₂ and NaOH
D

H₂ and O₂

Solution

Electrolysis of aq. NaBr :
At Anode
Oxidation of Br^- occurs.
$2B{r^ - } - 2{e^ - } \to B{r_2}$
At Cathode
Reduction of H₂O occurs:
$2{H_2}O \rightleftharpoons {H_2} + 2O{H^ - } - 2{e^ - }$
After the electrolysis Na+ and Br¯ combines to form NaBr. The products are H₂ , Br₂, NaBr

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