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Question

What would be the observations when aqueous ammonia is added to a solution of zinc nitrate (until in excess) and heated?

A
White precipitate formed. On heating, a colourless, pungent gas evolved.
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B
White precipitate formed which dissolved in excess aqueous ammonia to form a colourless solution.
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C
White precipitate formed which dissolved in excess aqueous ammonia to form a colourless solution. On heating, a colourless, pungent gas evolved.
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D
Blue precipitate formed which dissolved in excess aqueous ammonia to form a dark blue solution. On heating, a colourless, pungent gas evolved .
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Solution

The correct option is C White precipitate formed which dissolved in excess aqueous ammonia to form a colourless solution. On heating, a colourless, pungent gas evolved.
The ammonia, being a weak base, produces hydroxide ions in the water.
Zn2+(aq)+2OH(aq)Zn(OH)2(s)
The zinc hydroxide is the white precipitate.
If you continue to add the ammonia solution the precipitate redissolves because of the formation of the soluble ion Zn(NH3)4 to give a colourless solution. When heated ammonia gas is evolved which is pungent in smell.

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