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
M−Cd, M2S−CdS
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B
M−Hg, M2S−HgS
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C
M−Pb, M2S−PbS
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D
M−Cu, M2S−Cu2S
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Solution
The correct option is BM−Hg, M2S−HgS Reaction: Hg(NO3)2+H2S→HgS+2HNO3 black ppt.