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ZnSO₄+NH₄OH $â$ Zn(OH)₂ , A white ppt. insoluble in NH₄OH

FeCl₃+NH₄OH $â$ Fe₂O₃ .xH₂O ; A brown ppt. insoluble in NH₄OH

Cu⁺²+NH₃ $â$ [Cu(NH₃)₄]⁺² ; deep blue coloured

Ag⁺+NH₃ $â$ AgCl ; A white ppt. which is soluble in excess NH₃

answer is A.

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Detailed Solution

${Zn}^{+ 2} {â}_{limited}^{{NH}_{4} OH} Zn {(OH)}_{2} {â}_{excess}^{NH}$

Zn(OH)₂ being amphoteric acts like acid and reacts with NH₄OH to form soluble complex

Fe₂O₃.xH₂O (or) Fe(OH)₃ is a base. It can not react with a base like NH₄OH.It is insoluble in NH₄OH

AgCl dissolves in Ammonia to form a soluble complex

AgCl+2NH₃ $â$ [Ag(NH₃)₂]Cl

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