$2 O^{2-} \rightarrow O_{2}+4 e^{-}$
$4 A g^{+}+2 O^{2-} \rightarrow O_{2}+4 A g \ldots( i )$
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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($\Delta _o =$ crystal field splitting energy in an octahedral field, $P =$ Electron pairing energy)
$L(1s^2, 2s^2 2p^4); Q(1s^2, 2s^2 2p^6, 3s^2 3p^5)$
$P(1s^2, 2s^2 2p^6, 3s^1); R(1s^2, 2s^2 2p^6, 3s^2)$
The formulae of ionic compounds that can be formed between these elements are