Statement - I : [Cu(CN)₄]^2– is more stable than [Cu(H₂O)₄]²⁺
Statement - II : On heating [Cu(H₂O)₄]²⁺ with NH₃, [Cu(NH₃)₄]²⁺ is formed.

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Both statements I and II are correct

Statement-I is correct and statement-II is incorrect

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

answer is B.

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Detailed Solution

[Cu(CN)₄]^2– , CN^- is a strong field ligand , CFSE is high therefore this compound is more stable

[Cu(H₂O)₄]²⁺ , H₂O is a is a weak field ligand so CFSE is less therefore this compound is less stable

[Cu(H₂O)₄]²⁺ + 4 NH₃ $\overset{}{\to}$ [Cu(NH₃)₄]²⁺ + 4 H₂O

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