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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn204

Hydrogen is $- 1$ in metal and boron/aluminium hydrides, and +1 elsewhere; Na and Li are +1, Cl is $- 1$ . Select ALL correct statements.

AB in $NaBH X_{4}$ is $+ 3$
BAl in $LiAlH X_{4}$ is $+ 3$
CC in $CH X_{2} Cl X_{2}$ is $0$
DN in $NaNH X_{2}$ is $- 2$

Answer: A, B, C

NaBH X_{4}

:

1 + x - 4 = 0

, B = +3.

LiAlH X_{4}

: Al = +3.

CH X_{2} Cl X_{2}

:

x + 2 - 2 = 0

, C = 0.

NaNH X_{2}

:

1 + x + 2 = 0

gives N =

- 3

, not

- 2

.

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