Question

Statement-I: The alkali metals can form ionic hydrides which contain the hydride ion, $ H^-$.
Statement-II: The alkali metals have low electronegativity, their hydrides conduct electricity when fused and liberate hydrogen at the anode.

• A. Statement-I is true; Statement-II is true; Statement-II is the correct explanation for Statement-I
• B. Statement-I is true; Statement-II is true; Statement-II is not the correct explanation for Statement-I
• C. Statement-I is true; Statement-II is false
• D. Statement-I is false; Statement-II is true

Answer 1

Answer: (A)

Statement-I is true; Statement-II is true; Statement-II is the correct explanation for Statement-I

The alkali metals can form ionic hydrides which contain the hydride ion, $H^{-}$ as $NaH,KH,LiH$ and $CsH$.

Also, alkali metals have low electronegativity and in molten state they exists as ion and conduct electricity.

On electrolysis,

At anode $H^{-}$ oxidises and liberates hydrogen as

$2H^{-}-2e^{-}\to H_2$