An electric current is passed through silver voltameter connected… - Vidyadip

MCQ

An electric current is passed through silver voltameter connected to a water voltameter. The cathode of the silver voltameter weighed $0.108\,g$ more at the end of the electrolysis. The volume of oxygen evolved at $STP$ is ............... $\mathrm{cm}^{3}$

A
$56$
B
$550$
✓
$5.6$
D
$11.2$

✓

Answer

Correct option: C.

$5.6$

c
$A g^{+}+e^{-} \rightarrow A g$

$2 O^{2-} \rightarrow O_{2}+4 e^{-}$

$4 A g^{+}+2 O^{2-} \rightarrow O_{2}+4 A g \ldots( i )$

Amount of silver generated $=0.108 g$ No. of mole of $A g=\frac{0.108}{108}=0.001 mole$

No. of mole of $O_{2}$ generated from equation (i) $\frac{0.001}{4}$

$\begin{aligned} \text { volume of } O_{2} =\frac{0.001}{4} \times 22.4 \times 10^{3} cm ^{3} \\ =5.6 cm ^{3} \end{aligned} $

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