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Question

Redox reaction involves transfer of electrons between 2 chemical species. An unbalanced and incomplete example is shown below:
N2+H3PO2HN3+P4O6

If the above reaction were unidirectional towards right, what fraction of P4O6 would be left unreacted if reaction were started with stoichiometric amount of reactants.

A
12
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B
34
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C
13
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D
23
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Solution

The correct option is D 23
12N2+4H3PO28HN3+(P4O6+2H2O)
P4O6+6H2O4H3PO3
6 moles H2O reacts with 1 mole P4O6
2 moles H2O reacts with 1×26=13 mole P4O6
fraction of P4O6 left unreacted =23

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