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In qualitative analysis, in order to det...

In qualitative analysis, in order to detect second group basic radical, HS gas is passed in the presence of dilute HCI to

A

increase the dissociation of `H_(2)S`

B

decrease the dissociation of salt solution

C

decrease the dissociation of `H_(2)S`

D

increase the dissociation of salt solution

Text Solution

Verified by Experts

The correct Answer is:
C
The original solution must be free from any oxidising agent otherwise`H_(2)S` gets oxidised with precipitation of free sulphur. This is done by heating the mixture with concentrated HC1 for sufficient time during preparation of original solution.
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