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Question

As2S3+NO3+H2OAsO34+SO24+NO+H
The number of electrons involved in the oxidation reaction is:

A
22
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B
24
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C
26
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D
28
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Solution

The correct option is D 28
The balance reaction given below shows that the number of electrons involved is 28.
+3As22x=62AsO34+4e2x16=62x=10
S633x=63SO24+24e3x24=63x=18
_________________________________________
As2S32AsO34+3SO24+28e
_________________________________________

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