1(ix)
A nitrate which forms a precipitate with ammonium hydroxide and is also soluble in excess of it:
- (a)ferrous nitrate
- (b)ferric nitrate
- (c)lead nitrate
- (d)copper nitrate
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copper nitrate
Reason — When copper nitrate reacts with ammonium hydroxide NH4OH, it initially forms a light blue precipitate of copper(II) hydroxide (Cu(OH)2).
This precipitate is soluble in excess ammonium hydroxide due to the formation of a deep blue complex, tetraamminecopper(II) ([Cu(NH3)4]2+), making it soluble.