Strong heating of which of these hydroxides gives the oxide and water?

A $CsOH$
B $KOH$
C $LiOH$
D $NaOH$

Answer: C

2 LiOH Li X_{2} O + H X_{2} O

on strong heating, because Li+ polarises the hydroxide ion and Li2O has a high lattice enthalpy. The other alkali metal hydroxides are thermally stable and melt or vaporise without decomposing.

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