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Question:

The correct order of thermal stability of hydroxide is:

Mg(OH)2<Sr(OH)2<Ca(OH)2<Ba(OH)2

Ba(OH)2<Sr(OH)2<Ca(OH)2<Mg(OH)2

Ba(OH)2<Ca(OH)2<Sr(OH)2<Mg(OH)2

Mg(OH)2<Ca(OH)2<Sr(OH)2<Ba(OH)2

Solution:

The correct order of thermal stability of hydroxide is Mg(OH)2<Ca(OH)2<Sr(OH)2<Ba(OH)2. On moving down the group, the lattice enthalpy increases and the thermal stability increases. Hence, option D is correct.