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The solubility product of As(2)O(3) is 1...

The solubility product of `As_(2)O_(3)` is `10.8 xx 10^(-9)`. It is 50% dissociated in saturated solution. The solubility of salt is

A

`10^(-2)`

B

`2xx10^(-2)`

C

`5 xx 10^(-3)`

D

` 5.4 xx 10^(-9)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset (S)(As_(2)O_(3))hArr underset (2S)(2AS^(3+))+ underset (3S) (3O^(2-))`
`K_(sp) = (2S)^(2) (3S)^(3)`
`10.8 xx 10^(-9) = 108S^(5)`
`S = 10^(-2)`
If dissociation is 50 % then solubility is ` 2 xx 10^(-2) ` mol/L .
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