Which of the following statement(s) is/are co | vedclass

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(A, C) $1$. $IE_1$ of $In$ $(579 \ kJ/mol)$ is greater than $IE_1$ of $Al$ $(577 \ kJ/mol)$ due to the poor shielding effect of $d$-electrons in $In$

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$NO_2^{-}$ and $O_3$ are isoelectronic species

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(A, C) $1$. $IE_1$ of $In$ $(579 \ kJ/mol)$ is greater than $IE_1$ of $Al$ $(577 \ kJ/mol)$ due to the poor shielding effect of $d$-electrons in $In$ (lanthanide contraction/d-block contraction effect). Thus,statement $A$ is correct.$2$. In aqueous solution,$Na^{\oplus}$ has a smaller hydration shell compared to $Al^{3+}$ because $Al^{3+}$ has a higher charge density. Therefore,$Al^{3+}$ is more heavily hydrated and has a larger hydrated radius. Statement $B$ is incorrect.$3$. $NO_2^{-}$ has $7 + 8 + 8 + 1 = 24$ electrons. $O_3$ has $8 + 8 + 8 = 24$ electrons. Since both have $24$ electrons,they are isoelectronic. Statement $C$ is correct.$4$. The correct decreasing order of electron affinity $(E.A.)$ is $Cl > F > Br$ because $F$ has a small size leading to inter-electronic repulsion. Statement $D$ is incorrect.

Which of the following statement$(s)$ is/are correct?

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Assertion : Best diagonal relationship is shown between $Be$ and $Al$.
Reason : Ionization energy of $Be$ is almost the same as that of $Al$.

The atomic numbers of elements $A, B, C$ and $D$ are $Z-1, Z, Z+1$ and $Z+2$,respectively. If $B$ is a noble gas,choose the correct statements from the following:
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