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Question

The compound of a metal M, Mx(NO3)y, when treated with hydrogen sulphide in neutral or dilute acidic medium forms a black precipitate of M and its sulphide. Identify the metal and its sulphide.

A
MCd, M2SCdS
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B
MHg, M2SHgS
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C
MPb, M2SPbS
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D
MCu, M2SCu2S
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Solution

The correct option is B MHg, M2SHgS
Reaction:
Hg(NO3)2+H2SHgS+2HNO3
black ppt.

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