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the solubility in water of sulphates down the Be group is
Be > Mg > Ca > Sr > Ba.

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High ionization energy

Increase in melting point

All of these

Higher coordination number

answer is C.

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Detailed Solution

In crystalline sulphates, the co-ordination number of the ions increases from Be to Ba so also the lattice energy hence solubility in $H_{2} O$ decreases.

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