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Q.

Which of the following statements about alkaline earth metals are correct ?

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a

Ba(OH)2 is stronger base than Mg(OH)2

b

CaCO3 decomposes at a higher temperature then BaCO3

c

SrSO4 is less soluble in water than CaSO4

d

Hydration energy of Sr2+ is greater than that of Be2+

answer is C, D.

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Detailed Solution

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Basic strength of hydroxides increases going down the group.
Be(OH)2<Mg(OH)2<Ca(OH)2<Sr(OH)2<Ba(OH)2
The solubility of the sulphates in water decreases down the group.Question Image
High solubilites of BeSO4 and MgSO4 are due to the high enthalpy of hydration of the smaller Be2+ and Mg2+ ions, which overcomes the lattice energy factor.
 

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