STD 12 - 4. d and f- block elements — JEE STD 11 Science — Question

Statement $I$ : The metallic radius of $\mathrm{Na}$ is $1.86 \mathrm{~A}^{\circ}$ and the ionic radius of $\mathrm{Na}^{+}$is lesser than $1.86 \mathrm{~A}^{\circ}$.

Statement $II$ : Ions are always smaller in size than the corresponding elements.

In the light of the above statements, choose the correct answer from the options given below :

$\Delta G_{f}^{o}\left(A g_{2} O\right)=-11.21\, kJ\,mol ^{-1}$

$\Delta G_{f}^{o}(Z n O)=-318.3\, kJ \,mol ^{-1}$

Then, $E^{o}$ cell of the button cell is.........$V$