Question

The oxidation number of B in NaBH₄ is ____________.

Options

• +3

• +4

• +5

• +6

Answer 1

The oxidation number of B in NaBH₄ is +3.

Explanation:

Let the oxidation number of B in NaBH₄ be x.

Oxidation number of Na = +1, H = −1 (for Hydride)

+1 + x + 4(−1) = 0

∴ x = +3