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One litre sample of hard water contains ...

One litre sample of hard water contains 0.006 mole `CaCl_2`. The minimum concentration of `Na_2SO_4` needed for the precipitation of `CaSO_4` is
(`K_(sp)` for `CaSO_4` is `3.0xx10^-6` at `25^oC`)

A

`6.2xx10^-3`

B

`4.2xx10^-5`

C

`5xx10^-4`

D

`6xx10^-7`

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AAKASH INSTITUTE ENGLISH-TEST 4-EXAMPLE
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