Q 2613612540.    

Assertion : solubility of `BaSO_4` in 0.1 M `Na_2SO_4` is `10^-9` M hence its `K_(sp)` is `10^-18`

Reason : because for `BaSO_4 K_(sp) = (s)^2` [symbols have their usual meanings]

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

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