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Q.

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a

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

b

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

c

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

d

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

answer is A.

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Detailed Solution

Zn+2→limitedNH4OH Zn(OH)2 â†’excessNHZn(OH)2 being amphoteric acts like acid and reacts with NH4OH to form soluble complexFe2O3.xH2O (or) Fe(OH)3 is a base. It can not react with a base like NH4OH.It is insoluble in NH4OHAgCl dissolves in Ammonia to form a soluble complexAgCl+2NH3 â†’[Ag(NH3)2]Cl
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