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JEE Main levelSingle correct optionDifficulty 2 of 3sb021

Which statement about sodium hydride is correct?

AHydrogen in it has oxidation state $+ 1$ .
BIt conducts electricity in the solid state.
CIt reacts with water to give an acidic solution.
DIt has the rock-salt ( $NaCl$ -type) structure and contains $H X^{-}$ ions.

Answer: D

NaH

is a saline hydride with

Na X^{+}

and

H X^{-}

in an

NaCl

-type lattice. Solid ionic compounds do not conduct because the ions are fixed. It reacts with water as

NaH + H X_{2} O NaOH + H X_{2}

giving a basic solution, and hydrogen is in the

- 1

state.

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