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For the precipitation of cations of grou...

For the precipitation of cations of group four in the qualitative analysis, the medium is made alkaline before passing `H_(2)S` gas. The purpose of alkaline solution is

A

to supress the ionisation of `H_(2)S`

B

to increase the ionisation of `H_(2)S`

C

to increase the ionisation of metal salt

D

to decrease the ionisation of metal salt.

Text Solution

Verified by Experts

The correct Answer is:
B
`H_(2)S hArr 2H^(+) +S^(-2)`
`NH_(4)OH rarr NH_(4)^(+) +OH^(-)`
`H^(+)` combines with `OH^(-)` to form water and thus the first equilibrium shifts in the forward direction to increase the ionisation of `H_(2)S`.
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