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Question

As2S3+xNO3+yH+2AsO34+zNO2+aS+2H2O Here x,y,z and a respectively are

A
10, 4, 10, 3
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B
5, 4, 5, 3
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C
4, 10, 3, 10
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D
None of these
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Solution

The correct option is A 10, 4, 10, 3
This is a very special case of redox reactions. Note that the given reaction involves two oxidations and one reduction process.
a. Two oxidation half reactions are
i.As3+AsO34ii.S2S
Now balance and add the two equations to get
2As3++3S2+8H2O2AsO34+3S+16H++10e
b. Reduction half reaction: NO3NO2
Now balance the reduction half reaction and proceed as usual .
NO3+2H++1eNO2+H2O
Adding the two reactions (i) and (ii), we get
As2S3+10NO3+4H+2AsO34+10NO2+3S+2H2O
Note : In the above type of cases, take the total change in oxidation state (increase or decrease) for cross multiplication while adding oxidation and reduction half reactions. For example, in the given case, 10 electrons are lost per mole of As2S3.

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