JEE Main 2024 Chemistry question
Consider the following test for a group-IV cation. M²⁺ + H₂S → A (Black precipitate) + byproduct; A + aqua regia → B + NOCl + S + H₂O; B + KNO₂ + CH₃COOH → C + byproduct. The spin only magnetic moment value of the metal complex C is BM. (Nearest integer)
Answer: 0
Solution
The group IV cation is Co²⁺: Co²⁺ + H₂S → CoS (black, A). CoS dissolves in aqua regia to give Co²⁺ (B) + NOCl + S + H₂O. Co²⁺ with
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