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Question

In the reaction; As2S3+HNO3H3AsO4+H2SO4+NO, the element oxidised is/are :

A
As only
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B
S only
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C
N only
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D
As and S both
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Solution

The correct option is D As and S both
Reaction:
As2S3+HNO3H3AsO4+H2SO4+NO
+3 -2 +5 +5 +6 +2
(oxidation) (oxidation) (reduction)
Hence, the elements oxidised are both As and S.

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