Chemistry - Complete Pblock- Question with Solution | TestHub

Key Idea : Small anion forms stable compounds with small cation. The thermal stability of alkali metal hydrides decreases as : $$\mathrm{LiH}>\mathrm{NaH}>\mathrm{KH}>\mathrm{RbH}>\mathrm{CsH}$$ because the size of cation increases as : $${\mathrm{Li}}^{+}<{\mathrm{Na}}^{+}<{\mathrm{K}}^{+}<{\mathrm{Rb}}^{+}<{\mathrm{Cs}}^{+}$$