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Question
Assign oxidation numbers to the underlined elements in the following species:
NaBH4
Solution
NaBH4
| +1 | x | -1 |
| Na | B | H4 |
Then, we have
1(+1) + 1(x) + 4(-1) = 0
⇒ 1 + x - 4 = 0
⇒ x = + 3
Hence, the oxidation number of B is + 3.
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