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Question

Identify the oxidant and the reductant in the following reaction respectively:
3Na2HAsO3+KBrO3+6HCl6NaCl+KBr+3H3AsO4

A
Na2HAsO3 & KBrO3
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B
KBrO3 & Na2HAsO3
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C
HCl & KBr
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D
KBr & HCl
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Solution

The correct option is B KBrO3 & Na2HAsO3
(+3)3Na2HAsO3+(+5)KBrO3+6HCl6NaCl+(1)KBr+3(+5)H3AsO4.
It is a redox reaction.
Oxidant are compound which get reduced and oxide the other compound.
Reductant are compound which get oxidised and reduce the others.
Here As+3 lose 2 electron and get oxidised to +5 oxidation state. Hence Na2HAsO3 is an reducing agent or reductant.
(+3)Na2HAsO3(reductant)(+5)H3AsO4(oxidation half).

Also Br+5 gains 6 electron and get reduced to -1 oxidation state. Hence KBrO3 is the oxidising agent or oxidant.
(+5)KBrO3(oxidant)(1)KBr(reduction half half).


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