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JEE Main levelSingle correct optionDifficulty 2 of 3rx017

Hydrogen has oxidation number $- 1$ in BOTH species of the pair

A $CaH X_{2}$ and $LiAlH X_{4}$
B $NaH$ and $H X_{2} O$
C $CH X_{4}$ and $HCl$
D $NH X_{3}$ and $H X_{2} S$

Answer: A

In saline hydrides like

CaH X_{2}

and in the complex hydride

LiAlH X_{4}

, H is bonded to a less electronegative metal and is

- 1

(Al is

+ 3

). In

H X_{2} O

,

CH X_{4}

,

HCl

,

NH X_{3}

,

H X_{2} S

hydrogen is

+ 1

.

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