AP EAPCET 04-Jul-2022 Shift 1 Paper

According to Fajan's rule; covalent character in ionic compound depends on(i) size and charge of cation(ii) size and charge of anion(iii) pseudo-inert gas configuration (a). Size of iodide $(\mathrm{I}^{-})$is more than $\mathrm{F}^*$, so $\mathrm{I}^{-}$has more polarisibility. Thus, $\mathrm{KI}$ is more covalent than KF. So, option (a) is incorrcct.(b) Charge on $\mathrm{Sn}$ in $\mathrm{SnCl}_4$ is $+4$ and in $\mathrm{SnCl}_2$ is $+2$ So. Sn has more polarising power in $\mathrm{SnCl}_4$. Thus, $\mathrm{SnCl}_4$ is more covalent than $\mathrm{SnCl}_2$. So, option (b) is incorrect.(c) Size of $\mathrm{Li}^{+}$is less than $\mathrm{K}^{+} \cdot \mathrm{So}$, it has more polarising power. Thus, LiF is more covalent than KF. Hence, option (c) is correct.(d) Charge on $\mathrm{Zn}$ is $+2$ and on $\mathrm{Na}$ is $+1$. So, $\mathrm{Zn}$ has more polarising power. Thus, $\mathrm{ZnCl}_2$ is more covalent than NaCl. Hence, option (d) is incorrect.