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$(R = 8.314\,J\,{\rm{degre}}{{\rm{e}}^{{\rm{ - 1}}}}mo{l^{ - 1}})$
$Zn(s) + N{i^{2 + }}(a = 1.0)$ $\rightleftharpoons$ $Z{n^{2 + }}(a = 10) + Ni(s)$ occurs, is found to be $0.5105\,V$ at $298\,K$. The standard e.m.f. of the cell is ............ $\mathrm{V}$
[nearest integer]
(Given: atomic mass of $N =14\, g \,mol ^{-1}$ and of $O$ $=16\, g\, mol ^{-1}$.
Molar heat capacity of $N _{2} O$ is $100\, JK ^{-1}\, mol ^{-1}$ )
$(i)\, LiF > LiCl > LiBr > LiI$
$(ii)\, CaCl_2 < FeCl_2 < FeCl_3$
$(iii)Hg_2Cl_2 > HgCl_2$
$(iv)\, ZnCl_2 < CdCl_2 < HgCl_2$
$(v) CuCl < AgCl < AuCl$
$(vi) AlN > Al_2O_3 > AlF_3$
$(vii) CaF_2 < CaCl_2 < CaBr_2 < CaI_2$

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Choose the correct option($s$).
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