Which of the following sulphides are soluble only in aqua-regia?

N i S

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C o S

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H g S

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C d S

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Solution

The correct options are
A $N i S$
B $C o S$
C $H g S$
Option (A),(B),(C) are correct. $N i S$ , $C o S$ , $H g S$ are soluble in aquaregia while $C d S$ dissolves in $c o n c . H N O_{3}$ .

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H g S

H g C l_{2}

H g C l_{2}

What is aqua regia? Give examples of metals that are soluble in aqua regia

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