Which one among the following statements is/a | vedclass

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(D) The explanation of the given statements is as follows:$I$. Both beryllium $(Be)$ and barium $(Ba)$ belong to the same group (group-$2$). As we mov

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$I, III$

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(D) The explanation of the given statements is as follows:$I$. Both beryllium $(Be)$ and barium $(Ba)$ belong to the same group (group-$2$). As we move down the group,the size of the atom/ion increases,and the covalent character decreases. Thus,$Ba$ compounds are generally less covalent than $Be$ compounds. Therefore,statement $I$ is not correct.$II$. The electron gain enthalpy of $He$ is positive due to its very small size and fully-filled electronic configuration $(1s^2)$. Hence,statement $II$ is correct.$III$. The oxidation state of $O$ in $OF_2$ is $+2$,whereas the oxidation state of $O$ in $Na_2O$ is $-2$. Hence,statement $III$ is not correct.$IV$. Both $Na^{+}$ and $F^{-}$ are isoelectronic species (both have $10$ electrons). However,$Na^{+}$ has $11$ protons while $F^{-}$ has $9$ protons. Due to the higher nuclear charge in $Na^{+}$,it exerts a greater attractive force on the electrons,making its radius smaller than that of $F^{-}$. Hence,statement $IV$ is correct.Since statements $I$ and $III$ are not correct,the correct option is $(D)$.

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