Q20 / 90 · JEE Main 2024 (05 Apr Shift 2) · Chemistry
The correct statements from the following are :
(A) The decreasing order of atomic radii of group 13 elements is \(\mathrm{Tl}>\) In \(>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}\).
(B) Down the group 13 electronegativity decreases from top to bottom.
(C) \(\mathrm{Al}\) dissolves in dil. \(\mathrm{HCl}\) and liberates \(\mathrm{H}_2\) but conc. \(\mathrm{HNO}_3\) renders \(\mathrm{Al}\) 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 \(\mathrm{Al}\) in \(\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) ion is \(\mathrm{sp}^3 \mathrm{~d}^2\).
Choose the correct answer from the options given below :
- A(A), (C) and (E) only
- B(A) and (C) only
- Correct answerC(C) and (E) only
- D(A), (B), (C) and (E) only
Solution
A. size order $\mathrm{T} \ell>\mathrm{In}>\mathrm{Al}>\mathrm{Ga}>\mathrm{B}$
B. Electronegativity order $\mathrm{B}>\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{T} \ell$
D. $\mathrm{B}, \mathrm{Al}$ are more stable in +3 oxidation state
So, only C, E statements are correct.
So, only C, E statements are correct.
Hence, the correct answer is option: 'C'.