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Redox Reactions

Question
CBSEENCH11006743

Assign oxidation number of the underlined elements in each of the following species:
  Na bottom enclose straight B straight H subscript 4




Solution

Let the oxidation number of B =x
Oxidation number of Na =+1
Oxidation number of H =-1
Therefore the oxidation number of B is,
1+ x+4(-1) =0
x-3=0
x= 3