Statement-I : [Fe(NH₃)₆]⁺² is less stable than [Co(NH₃)₆]⁺²
Statement-II : The smaller the radius of the cation, the greater is the stability of its complex ion.

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If both statements, I and II, are correct.

If both statements, I and statement II, are incorrect.

If statement I correct, but statement II is incorrect.

If statement I incorrect, but statement II is correct.

answer is A.

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Detailed Solution

Stability of the complexes of divalent metal ions of 3d-transition series with a given ligand is inversely proportional to the ionic radius of the cation.

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