1000 , mL 1 , M CuSO_4(aq) is electrolysed by 9.65 , amp current … - Vidyadip

MCQ

$1000\, mL$ $1\, M$ $CuSO_4(aq)$ is electrolysed by $9.65\, amp$ current for $100\, sec$ using $Pt-$ electrode. Which is incorrect statemenet?

A
Blue colour intensity decreases during electrolysis
B
Blue colour intensity remains constant if $Cu-$ electrode used.
✓
$pH$ of solution is $8$ after electrolysis
D
At anode $O_2$ gas liberated during electrolysis

✓

Answer

Correct option: C.

$pH$ of solution is $8$ after electrolysis

c
$CuSO _{4} \rightleftharpoons Cu ^{2+}+ SO _{4}^{2-}$ is formed from strong acid $H _{2} SO _{4}$ and weak base $Cu ( OH )_{2}$.

Hence, the $C u S O_{4}$ is acidic in nature and it's $p H$ is thus less than $7$ always.

The incorrect statement is $p H$ of solution after electrolysis is $8$.

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