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One litre of a saturated solution of CaC...

One litre of a saturated solution of `CaCO_(3)` is evaporated to dryness due to which `7.0` mg of residue is left .
The solubility product for `CaCO_(3)` is

A

`4.9 xx 10^(-8)`

B

`4.9 xx10^(-5)`

C

`4.9 xx 10^(-9)`

D

`4.9 xx10^(-7)`

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