The sBlock Elements - Result Question 30
####35. In which of the following the hydration energy is higher than the lattice energy?
[2007]
(a) $MgSO_4$
(b) $RaSO_4$
(c) $SrSO_4$
(d) $BaSO_4$
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Solution:
- (a) The solubility and the hydration energy of sulphates of alkaline earth metals decreases as we move down the group from $Be$ to $Ba$ due to the reason that ionic size increases down the group. The lattice energy remains constant because sulphate ion is so large, so that small change in cationic sizes do not make any difference. Thus the order will be:
$BeSO_4>MgSO_4>CaSO_4>SrSO_4>BaSO_4$
(b) Calcium is obtained by electrolysis of a fused mass consisting six parts calcium chloride and one part calcium fluoride at about $700^{\circ} C$ in an electrolytic cell.
