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JEE Main levelSingle correct optionDifficulty 2 of 3bn137

In sodium borohydride, $NaBH X_{4}$ , hydrogen is present as hydride ( $- 1$ ) and Na is $+ 1$ . What is the oxidation number of B?

A $+ 3$
B $- 3$
C $+ 5$
D $+ 1$

Answer: A

The oxidation numbers must add up to zero.

1 + x + 4 (- 1) = 0

gives

x = + 3

.

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