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The incorrect statement(s) among the following is (are): ¡) Primary valency of a transition metal ion in complex represent its oxidation number. ii) \( Z n^{2+} \) is colourless. iii) \( M n C l_{2} \) exhibits green color in aqueous solution. iv) \( F e, C o, N i \) complexes are diamagnetic in nature.

1. i and ii
2. ii only
3. iii and iv
4. iv only

Correct answer: iv only

Solution

Statements i, ii, and iii are correct: primary valency corresponds to oxidation state, Zn2+ is d10 and colorless, and aqueous MnCl2 is pale pink/greenish. Statement iv is incorrect because many Fe, Co, and Ni complexes contain unpaired electrons and are paramagnetic, not diamagnetic.

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