The right order of the solubility of sulphates of alkaline earth metals in water is

Be > Ca > Mg > Ba > Sr

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Mg > Be > Ba > Ca > Sr

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Be > Mg > Ca > Sr > Ba

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Mg > Ca > Ba > Be > Sr

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Solution

The correct option is C
Be > Mg > Ca > Sr > Ba

Be > Mg > Ca > Sr > Ba

On moving down the group lattice energy remains almost constant as the sulphate is so big that small

increase in the size of the cations fromBe toBa does not make any difference. However the hydration
energy decreases from $B e^{2 +}$ to $B a^{+ 2}$ . This causes decrease in the solubility of the sulphates as the ionic size increases.

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B e, M g, C a, S r, B a

B e^{2 +}

M g^{2 +},

S r^{2 +}

C a^{2 +}

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