The correct statements from the following are : (A) Tl^ 3+ is a powerful oxidising agent (B) Al^ 3+ does not get reduced easily (C) Both Al^ 3+ and Tl^ 3+ are very stable in solution (D) Tl^ + is more stable than Tl^ 3+

Correct answer: B. (A), (B), (D) and (E) only (i) True, T ^ + is more stable than T ^ 3+ , due to inert pair effect. So T ^ 3+ is a powerful oxidising agent. (ii) True, E_ Al^ 3+/ A 1 ^0=-1.66 ~V . So it is difficult to reduce A ^ 3+ . So A ^ 3+ is highly stable. (iii) False, as T ^ 3+ is unstable (iv) True, T ^ + is more stable than T ^ 3+ (v) True, A ^ 3+ and T ^ + are highly stable

JEE Main 20257 AprilEvening Shift

Exam: JEE Main
Year: 2025
Date: 7 April
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2025 · 7 April · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The correct statements from the following are : (A) Tl^ 3+ is a...

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 :

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

Correct answer

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

Step-by-step 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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