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Classification of Colloids - Based on nature of interaction

Precipitation...

Question

Precipitation of second group sulphides in qualitative analysis is carried out with $H_{2} S$ in presence of___.

A

H C l

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B

H N O_{3}

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C

K C l

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D

N a C l

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Solution

The correct option is A $H C l$
$H {N O}_{3}$ , is a strong oxidant, will oxidise $H_{2} S$ to give colloidal sulphur. Thus precipitation of second group sulphide will not occur in presence of $H N O_{3}$
$H_{2} S [O] - --- \to H {N O}_{3} H_{2} O + S$

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