The least stable one among group one metal hydrides is :

LiH

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NaH

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RbH

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CsH

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Solution

The correct option is A CsH
On moving down the group of alkali metals, the atomic and ionic sizes increases. Consequently, the stability of metal hydrides decreases. Thus CsH is least stable. This is because, the bigger $C s^{+}$ cation cannot form an efficient close packing with small $H^{-}$ anion in the crystal lattice. Due to this the bond between Cs and H is weakest.

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