Select the correct order.

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(C) $1$. In molten state,conductivity depends on the mobility of ions. As the size of the cation increases $(Mg^{+2} < Ca^{+2} < Sr^{+2} < Ba^{+2})$,t

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$Li < Na < K < Rb < Cs$ (Reactivity)

Vedclass · Answer

(C) $1$. In molten state,conductivity depends on the mobility of ions. As the size of the cation increases $(Mg^{+2} $2$. Hydration energy is inversely proportional to the size of the ion. Since the size increases from $Li^{+1}$ to $Cs^{+1}$,the hydration energy decreases. Thus,the order $Li^{+1} > Na^{+1} > K^{+1} > Rb^{+1} > Cs^{+1}$ is correct,making option $B$ incorrect.$3$. Reactivity of alkali metals increases down the group due to the decrease in ionization enthalpy. Thus,$Li $4$. Since option $B$ is incorrect,the correct answer is $C$.

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