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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn039

Hydrogen takes the oxidation number $- 1$ when bonded to a less electronegative element. In which of the following is H at $- 1$ ? (Li, Na, Ca, Al, B take $+ 1$ , $+ 1$ , $+ 2$ , $+ 3$ , $+ 3$ in these compounds.)

A $LiAlH X_{4}$
B $CaH X_{2}$
C $NaBH X_{4}$
D $H X_{2} O X_{2}$

Answer: A, B, C

LiAlH X_{4}

:

1 + 3 + 4 h = 0

gives

h = - 1

.

NaBH X_{4}

:

1 + 3 + 4 h = 0

gives

h = - 1

.

CaH X_{2}

:

2 + 2 h = 0

gives

h = - 1

. In

H X_{2} O X_{2}

H is bonded to the more electronegative O and is

+ 1

.

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