JEE Main 2026 — d and f Block Elements Question with Solution
JEE Main 2026 (28 January Shift 1)
Question
Given below are two statements:
Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3. and
Statement II: is the strongest reducing agent among and .
In the light of the above statements, choose the correct answer from the options given below
Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3. and
Statement II: is the strongest reducing agent among and .
In the light of the above statements, choose the correct answer from the options given below
Choose an option
Show full solutionCorrect option: A
Correct answer
ABoth Statement I and Statement II are false
Step-by-step explanation
[Sc³⁺, Ti³⁺] has Sc³⁺ colorless (no d-electrons) and Ti³⁺ colored;
[Mn²⁺, Cr²⁺] has Mn²⁺ colorless (d⁵ half-filled, no d-d transitions) and Cr²⁺ colored;
[Cu²⁺, Zn²⁺] has Cu²⁺ colored and Zn²⁺ colorless (d¹⁰ filled);
[Ni²⁺, Ti⁴⁺] has Ni²⁺ colored and Ti⁴⁺ colorless (no d-electrons).
Zero pairs have both ions colored. Statement I is FALSE.
Th⁴⁺ is not a reducing agent. Statement II is FALSE.
Both statements are false.
[Mn²⁺, Cr²⁺] has Mn²⁺ colorless (d⁵ half-filled, no d-d transitions) and Cr²⁺ colored;
[Cu²⁺, Zn²⁺] has Cu²⁺ colored and Zn²⁺ colorless (d¹⁰ filled);
[Ni²⁺, Ti⁴⁺] has Ni²⁺ colored and Ti⁴⁺ colorless (no d-electrons).
Zero pairs have both ions colored. Statement I is FALSE.
Th⁴⁺ is not a reducing agent. Statement II is FALSE.
Both statements are false.
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