A colorless water-soluble compound on strong heating liberates a...

A colorless water-soluble compound on strong heating liberates a brown colored gas and leaves a yellow residue that turns white on cooling. An aqueous solution of the original solid gives a white precipitate with \left(\mathrm{NH}_4\right)_2 \mathrm{~S}

. The original solid is

Options

A $\mathrm{Zn}\left(\mathrm{NO}_3\right)_2$
B $\mathrm{Ca}\left(\mathrm{NO}_3\right)_2$
C $\mathrm{Al}\left(\mathrm{NO}_3\right)_3$
D $\mathrm{NaNO}_3$

Correct answer

A. $\mathrm{Zn}\left(\mathrm{NO}_3\right)_2$

Step-by-step solution

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