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The charge on As(2) S(3) sol is due to p...

The charge on `As_(2) S_(3)` sol is due to prefentially adsorbed:

A

`H^(+)`

B

`OH^(-)`

C

`O^(-2)`

D

`S^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`As_(2)S_(3)` colloidal sol is obtained when `As_(2)O_(3)` is saturated with `H_(2)S` :
`As_(2)O_(3) + 3H_(2)S to As_(2)S_(3) + 3H_(2)O`.
`As_(2)S_(3)` adsorbs `S^(2-)` ions )(common between `H_(2)S` and `As_(2)S_(3)` and thus is negatively charged).
`As_(2)S_(3) + H_(2)S to As_(2)S_(3)` `" "S^(2-) : 2H^(+).`
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