Assertion : $B e S O_{4}$ and $M g S O_{4}$ are insoluble in water. Reason: $B e^{2 +}$ and $M g^{2 +}$ have low hydration enthalpies.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
The greater hydration enthalpies of $B e^{2 +}$ and $M g^{2 +}$ ions overcome the lattice enthalpy factor and therefore, their sulphates are soluble in water.

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Assertion: Be and Al have similar properties.

Reason: $B e^{2 +}$ and $A l^{3 +}$ have nearly the same charge/volume ratios and similar polarising power.

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