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solubility product of radium sulphate is...

solubility product of radium sulphate is `4xx10^(-9)`. What will be the solubility of ` Ra^(2+)` in ` 0.10 M` ` NaSO_(4)`?

A

`4xx10^(-10)M`

B

`2xx10^(-5) M`

C

`4xx10^(-5) M`

D

`2xx10^(-10) M`

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