Assertion :Sulphate is estimated as $B a S O_{4}$ and not as $M g S O_{4}$ . Reason: Ionic radius of ${M g}^{2 +}$ is smaller than ${B a}^{2 +}$ .

Assertion is correct but reason is wrong

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Assertion is wrong but reason is correct

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Both assertion and reason are correct and reason is correct explanation of assertion

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Both assertion and reason are correct but reason is not correct explanation of assertion

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Solution

The correct option is D Both assertion and reason are correct but reason is not correct explanation of assertion
As we move down the group, ionic radius increases, so radius of $M g$ ion is lesser than that of $B a$ ion.
Sulfate is estimated as $B a S O_{4}$ as it forms precipitate (insoluble). While $M g S O_{4}$ is water soluble.

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Assertion :Sulphate is estimated as BaSO4 and not as MgSO4. Reason: Ionic radius of Mg2+ is smaller than Ba2+.

Assertion :Sulphate is estimated as $B a S O_{4}$ and not as $M g S O_{4}$ . Reason: Ionic radius of ${M g}^{2 +}$ is smaller than ${B a}^{2 +}$ .