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In qualitative analysis, in order to detect second group basic radical, H2S gas is passed in the presence of dilute HCl to:

A
increase the dissociation of H2S
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B
decrease the dissociation of salt solution
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C
decrease the dissociation of H2S
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D
increase the dissociation of salt solution
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Solution

The correct option is C decrease the dissociation of H2S
In qualitative analysis, in order to detect second group basic radical, H2S gas is passed in the presence of dilute HCl to Decrease the dissociation of H2S.
Note: HCl decreases ionization of H2S due to common ion effect so that only the solubility product of sulfides of group II radicals is overpowered and not that of III, IV and V group. Hence, group III, IV and V radicals are not precipitated by H2S in presence of HCl.

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