The correct statements from the following are : (A) $\mathrm{Tl}^{3+}$ is a powerful oxidising agent (B) $\mathrm{Al}^{3+}$ does not get reduced easily (C) Both $\mathrm{Al}^{3+}$ and $\mathrm{Tl}^{3+}$ are very stable in solution (D) $\mathrm{Tl}^{+}$is more stable than $\mathrm{Tl}^{3+}$ (E) $\mathrm{Al}^{3+}$ and $\mathrm{Tl}^{+}$are highly stable Choose the correct answer from the options given below :

JEE Main 2025 — Chemistry Inorganic Chemistry

2025mcqmedium

The correct statements from the following are :

(A) $\mathrm{Tl}^{3+}$ is a powerful oxidising agent

(B) $\mathrm{Al}^{3+}$ does not get reduced easily

(D) $\mathrm{Tl}^{+}$ is more stable than $\mathrm{Tl}^{3+}$

(E) $\mathrm{Al}^{3+}$ and $\mathrm{Tl}^{+}$ are highly stable

Choose the correct answer from the options given below :

Official previous-year question

Held on 7 Apr 2025 · Verified 6 Jul 2026.

Options

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

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Solution

(i) True, $\mathrm{T} \ell^{+}$ is more stable than $\mathrm{T} \ell^{3+}$ , due to inert pair effect. So $\mathrm{T} \ell^{3+}$ is a powerful oxidising agent.

(ii) True, $\mathrm{E}_{\mathrm{Al}^{3+/ A 1}}^0=-1.66 \mathrm{~V}$ . So it is difficult to reduce $\mathrm{A} \ell^{3+}$ . So $\mathrm{A} \ell^{3+}$ is highly stable.

(iii) False, as $\mathrm{T} \ell^{3+}$ is unstable

(iv) True, $\mathrm{T} \ell^{+}$ is more stable than $\mathrm{T} \ell^{3+}$

(v) True, $\mathrm{A} \ell^{3+}$ and $\mathrm{T} \ell^{+}$ are highly stable

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Solution

(i) True, $\mathrm{T} \ell^{+}$ is more stable than $\mathrm{T} \ell^{3+}$ , due to inert pair effect. So $\mathrm{T} \ell^{3+}$ is a powerful oxidising agent.

(ii) True, $\mathrm{E}_{\mathrm{Al}^{3+/ A 1}}^0=-1.66 \mathrm{~V}$ . So it is difficult to reduce $\mathrm{A} \ell^{3+}$ . So $\mathrm{A} \ell^{3+}$ is highly stable.

(iii) False, as $\mathrm{T} \ell^{3+}$ is unstable

(iv) True, $\mathrm{T} \ell^{+}$ is more stable than $\mathrm{T} \ell^{3+}$

(v) True, $\mathrm{A} \ell^{3+}$ and $\mathrm{T} \ell^{+}$ are highly stable

JEE Main 2025 — Chemistry Inorganic Chemistry

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JEE Main 2025 — Chemistry Inorganic Chemistry

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JEE Main Inorganic Chemistry in other years

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Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

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