Q7 / 75 · JEE Main 2025 (7 Apr Shift 2) · Chemistry
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 :
(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 :
- A(A), (B), (C), (D) and (E)
- Correct answerB(A), (B), (D) and (E) only
- C(B), (D) and (E) only
- D(A), (C) and (D) only
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
(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
Hence, the correct answer is option: 'B'.