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Types of Redox Reactions

The compound ...

Question

The compound of a metal $M$ , $M_{x} {(N O_{3})}_{y}$ , 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 - C d

,

M_{2} S - C d S

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B

M - H g

,

M_{2} S - H g S

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C

M - P b

,

M_{2} S - P b S

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D

M - C u

,

M_{2} S - C u_{2} S

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Solution

The correct option is B $M - H g$ , $M_{2} S - H g S$
Reaction:
$H g (N O_{3})_{2} + H_{2} S \to H g S + 2 H N O_{3}$
black ppt.

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