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17/12/2021 12:40 pm
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The correct order of thermal stability of hydroxides is
(a) Ba(OH)2 < Ca(OH)2 < Sr(OH)2 < Mg(OH)2
(b) Mg(OH)2 < Sr(OH)2 < Ca(OH)2 < Ba(OH)2
(c) Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2
(d) Ba(OH)2 < Sr(OH)2 < Ca(OH)2 < Mg(OH)2
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17/12/2021 12:41 pm
Correct answer: (d) Ba(OH)2 < Sr(OH)2 < Ca(OH)2 < Mg(OH)2
Explanation:
Stability of ionic compounds decreases with decrease in lattice enthalpy. Thus stability of alkaline earth metal hydroxides decreases with decrease in lattice enthalpy as the size of alkali earth metal cations increases down the group.