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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb049

Which of the following statements about sodium hydride are correct?

AIn its reaction with water the hydrogen of $NaH$ is oxidised from $- 1$ to $+ 1$ .
BIt reacts with water to give $NaOH$ and $H X_{2}$ .
CStrong heating of sodium formate gives sodium oxalate and $H X_{2}$ .
DIt reacts with $CO X_{2}$ to give sodium formate.

Answer: B, C, D

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

,

NaH + CO X_{2} HCOONa

and

2 HCOONa Na X_{2} C X_{2} O X_{4} + H X_{2}

are all correct. In the first reaction the hydride hydrogen goes from

- 1

to

0

(not

+ 1

), while the hydrogen from water goes from

+ 1

to

0

, so the last statement is wrong.

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