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JEE Main levelOne or more correct optionsDifficulty 2 of 3sb006

Which of the following statements about ionic (saline) hydrides such as $CaH X_{2}$ and $NaH$ are correct?

AThey react with water to evolve hydrogen gas.
BOn electrolysis of the molten hydride, hydrogen is liberated at the anode.
CThe alkali metal hydrides have the $NaCl$ -type structure.
DThey conduct electricity in the solid state.

Answer: A, B, C

Hydride ion is a strong base, so

H X^{-}

reacts with water to give

H X_{2}

. In the melt

H X^{-}

is oxidised at the anode,

2 H X^{-} H X_{2} + 2 e X^{-}

. Alkali metal hydrides crystallise in the rock-salt structure. Solid ionic hydrides do not conduct because the ions cannot move, so the last statement is wrong.

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