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Which one of the following statements is correct?

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$Ba {(OH)}_{2} > Ca {(OH)}_{2} > Mg {(OH)}_{2} > Be {(OH)}_{2}$ [Thermal stability]

${CaF}_{2} > {MgF}_{2} > {BaF}_{2} > {BeF}_{2}$ [solubility in water]

${BaCO}_{3} < {SrCO}_{3} < {CaCO}_{3} < {MgCO}_{3}$ [Thermal stability]

${BaSO}_{4} > {SrSO}_{4} > {CaSO}_{4} > {MgSO}_{4}$ [solubility in water]

answer is A.

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Detailed Solution

$B e S O_{4} to B a S O_{4} :$ Solubility decreases
$B e C O_{3} to B a C O_{3} :$ Thermal stability increases
$B e F_{2} > M g F_{2} > C a F_{2} > S r F_{2}$ : Solubility in water.

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