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Q.

A colorless water-soluble compound on strong heating liberates a brown colored gas as one of the products and leaves a residue. An aqueous solution of the original solid gives precipitate with  (NH4)2S and  NH4OH. The original solid could be

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a

Ca(NO3)2

b

Pb(NO3)2

c

Al(NO3)3

d

Zn(NO3)2

answer is A, B, D.

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