JEE Inorganic: Which Statements about Tl and Al are True? ✅
❓ Question Which of the following statements are correct ? (A) Tl³⁺ is a powerful oxidising agent (B) Al³⁺ does not get reduced easily (C) Both Al³⁺ and Tl³⁺ are very stable in solution (D) Tl⁺ is more stable than Tl³⁺ (E) Al³⁺ and Tl⁺ are highly stable 🖼️ Question Image ✍️ Short Solution We evaluate each statement using periodic trends, standard reduction potentials, and the inert-pair effect. (A) Tl³⁺ is a powerful oxidising agent — True Thallium in +3 state is relatively unstable because of the inert-pair effect (the 6s electrons are reluctant to participate in bonding). Tl³⁺ tends to accept electrons to form the more stable Tl⁺ (6s²), so it oxidizes other species and itself gets reduced → hence Tl³⁺ acts as a strong oxidant in solution. (B) Al³⁺ does not get reduced easily — True Aluminium’s standard reduction potential (Al³⁺/Al) is strongly negative (≈ −1.66 V), meaning reduction to metallic Al is thermodynamically unfavorable in aqueous solution. The...