Which of the following statements are correct | vedclass

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(D) Statement $I$: The electron gain enthalpy becomes more negative as we move across a period. The order of electronegativity is $P < S < Cl < F$. Th

Vedclass · Accepted Answer

$I, II, III$ only

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(D) Statement $I$: The electron gain enthalpy becomes more negative as we move across a period. The order of electronegativity is $P Statement $II$: In $Eu$ $([Xe] 4f^7 6s^2)$ and $Yb$ $([Xe] 4f^{14} 6s^2)$, the atomic radii do not show the expected decrease due to lanthanoid contraction because of the stable half-filled and fully-filled $4f$ subshells, which provide better shielding. Thus, Statement $II$ is correct.Statement $III$: Among lanthanoid hydroxides, basicity decreases as the ionic radius decreases (lanthanoid contraction). Since $Ce^{3+}$ has the largest ionic radius, $Ce(OH)_3$ is the most basic. Statement $III$ is correct.Statement $IV$: The radius of a cation is always smaller than its parent atom. $Na^+$ $(95 \ pm)$ is smaller than $Na$ $(186 \ pm)$. The statement incorrectly assigns the values. Statement $IV$ is incorrect.Therefore, statements $I, II,$ and $III$ are correct.

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