NEET 2026 (Phase 1) · ChemistryAtomic radiusPrevious Year Question

Identify the incorrect statement from the following:

Answer: (A) The largest and the smallest species among $Mg$ , $Mg X^{2 +}$ , $Al$ and $Al X^{3 +}$ are $Al$ and $Mg X^{2 +}$ respectively.. \textbf{Answer:} (A) The largest and the smallest species among $Mg$ , $Mg X^{2 +}$ , $Al$ and $Al X^{3 +}$ are $Al$ and $Mg X^{2 +}$ respectively.

A.The largest and the smallest species among $Mg$ , $Mg X^{2 +}$ , $Al$ and $Al X^{3 +}$ are $Al$ and $Mg X^{2 +}$ respectively.✓
B.The IUPAC name of the element with atomic number $107$ is Unnilseptium.
C.The similarity in behaviour of $Li$ with $Mg$ is referred to as the 'diagonal relationship'.
D.The oxidation state and covalency of $Al$ in $[AlCl (H X_{2} O) X_{5}] X^{2 +}$ are $3$ and $6$ , respectively.

Correct Answer

(A) The largest and the smallest species among $Mg$ , $Mg X^{2 +}$ , $Al$ and $Al X^{3 +}$ are $Al$ and $Mg X^{2 +}$ respectively.

Solution & Explanation

\textbf{Answer:} (A) The largest and the smallest species among $Mg$ , $Mg X^{2 +}$ , $Al$ and $Al X^{3 +}$ are $Al$ and $Mg X^{2 +}$ respectively. \textbf{Solution:} Among $Mg$ , $Mg X^{2 +}$ , $Al$ and $Al X^{3 +}$ , the largest is the neutral $Mg$ (more electrons and weaker effective nuclear pull than $Al$ ), and the smallest is $Al X^{3 +}$ (highest charge, fewest electrons). So statement A — claiming $Al$ is largest and $Mg X^{2 +}$ smallest — is incorrect. The other statements are correct: (B) the IUPAC name for $Z = 107$ is Unnilseptium; (C) the $Li$ - $Mg$ similarity is the diagonal relationship; (D) in $[AlCl (H X_{2} O) X_{5}] X^{2 +}$ the oxidation state of $Al$ is $+ 3$ and its covalency is $6$ .

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