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

`4.9xx10^-8`

`4.9xx10^-5`

`4.9xx10^-9`

`4.9xx10^-7`

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