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JEE Main levelSingle correct optionDifficulty 2 of 3bn020

In which of the following does nitrogen have the oxidation number $- 2$ (H is $+ 1$ , O is $- 2$ , Na is $+ 1$ )?

A $N X_{2} H X_{4}$
B $HN X_{3}$
C $NaNH X_{2}$
D $NH X_{2} OH$

Answer: A

N X_{2} H X_{4}

:

2 x + 4 = 0

gives

- 2

.

NH X_{2} OH

:

x + 2 - 2 + 1 = 0

gives

- 1

.

NaNH X_{2}

:

1 + x + 2 = 0

gives

- 3

.

HN X_{3}

:

1 + 3 x = 0

gives

- \frac{1}{3}

.

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