Verified Solution • 2025–26 Session moderate

QJEEM24Ch1e48: JEE Main 2024 Chemistry - Class 12 JEEM24Ch1e48 Solution: The correct statements from the following are : (A) The…

The correct statements from the following are :

(A) The decreasing order of atomic radii of group 13 elements is \mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B} .

(B) Down the group 13 electronegativity decreases from top to bottom.

(C) Al\mathrm{Al} dissolves in dil. HCl\mathrm{HCl} and liberates H2\mathrm{H}_2 but conc. HNO3\mathrm{HNO}_3 renders Al\mathrm{Al} passive by forming a protective oxide layer on the surface.

(D) All elements of group 13 exhibits highly stable +1 oxidation state.

(E) Hybridisation of Al\mathrm{Al} in [Al(H2O)6]3+[\mathrm{Al}(\mathrm{H}_2 \mathrm{O})_6]^{3+} ion is sp3d2\mathrm{sp}^3 \mathrm{d}^2 .

Choose the correct answer from the options given below :

Multiple Choice Options

  • A (A), (B), (C) and (E) only
  • B (C) and (E) only
  • C (A), (C) and (E) only
  • D (A) and (C) only

Step-by-Step Verified Solution

(A) Group-13 size : \mathrm{B}<\mathrm{Ga}<\mathrm{Al}<\mathrm{In} \simeq TI\mathrm{TI}

(B) In Group-13, Al has exceptional lower EN

\mathrm{EN}: \mathrm{B}>\mathrm{TI}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}

(C)amp;2Al+6HCl→2AlCl3+3H2amp;Al+HNO3→ No reaction (Due to protective oxide layer)\begin{aligned}\text{(C)} \quad & 2 \mathrm{Al}+6 \mathrm{HCl} \rightarrow 2 \mathrm{AlCl}_3+3 \mathrm{H}_2 \\& \mathrm{Al}+\mathrm{HNO}_3 \rightarrow \text { No reaction (Due to protective oxide layer)}\end{aligned}

(D) +1 oxidation state is observed mainly for heavier Group-13 element like TI\mathrm{TI} .

B\mathrm{B} and Al\mathrm{Al} do not show +1 oxidation state

(E) [Al(H2O)6]3+→\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \rightarrow Hybridisation : sp3d2s p^3 d^2

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