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Mathematics of Dipole Moment

Assertion: Su...

Question

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 that of $B a^{2 +}$ .

Both assertion and reason are true and reason is not the correct explanation of assertion.

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Both assertion and reason are true and reason is the correct explanation of assertion.

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Assertion is false but reason is true.

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Assertion is true but reason is false

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Solution

The correct option is A Both assertion and reason are true and reason is not the correct explanation of assertion.
As we move down the group, ionic radius increases, so radius of $M g^{2 +}$ ion is lesser than that of $B a^{2 +}$ ion.
Sulfate is estimated as $B a S O_{4}$ as it forms precipitate (insoluble) whereas $M g S O_{4}$ is water soluble.
$N a_{2} S O_{4} + B a C l_{2} \to B a S O_{4} ↓ (white precipitate) + 2 N a C l$

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