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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Redox Reactions

NTA Abhyas 2020 · Chemistry · Redox Reactions

The unbalanced equation for the reaction of P _ 4 S _ 3 with...

The unbalanced equation for the reaction of P4S3{P}_{4}{S}_{3} with nitrate in aqueous acidic medium is given below.
P4S3+NO3−→H3PO4+SO42−+NO{P}_{4}{S}_{3} + N{{O}_{3}}^{-} \to {H}_{3}P{O}_{4} + S{{O}_{4}}^{2 -} + NO
The number of moles of water required per mol of P4S3{P}_{4}{S}_{3} is x3\dfrac{x}{3}, the value of x\text{x} is

Correct answer

8

Step-by-step solution

P4S3+NO3−→H3PO4+SO42−+NO{P}_{4}{S}_{3} + N{O}_{3}^{-} \to {H}_{3}P{O}_{4} + S{{O}_{4}}^{2 -} + NO
(P4S3+28H2O→4H3PO4+3SO42−+44H++38e−)\times3( {\text{P}}_{\text{4}} {\text{S}}_{\text{3}} \text{+}\text{28}{\text{H}}_{\text{2}} \text{O} \to \text{4}{\text{H}}_{\text{3}} {\text{PO}}_{\text{4}} \text{+}\text{3}{\text{SO}}_{4}^{2 -} \text{+}\text{44}{\text{H}}^{\text{+}} \text{+38}{\text{e}}^{-} ) \text{\times}\text{3}
(NO3−+4H++3e−→NO+2H2O)\times38( {\text{NO}}_{3}^{-} \text{+}\text{4}{\text{H}}^{\text{+}} \text{+}\text{3}{\text{e}}^{-} \to \text{NO}\text{+}\text{2}{\text{H}}_{\text{2}} \text{O} ) \text{\times}\text{38}
∴3P4S3+38NO3−+8H2O+20H+→12H3PO4+9SO42−+38NO∴ \text{3}{\text{P}}_{\text{4}} {\text{S}}_{\text{3}} \text{+}\text{38}{\text{NO}}_{3}^{-} \text{+}\text{8}{\text{H}}_{\text{2}} \text{O}\text{+}\text{20}{\text{H}}^{\text{+}} \to \text{12}{\text{H}}_{\text{3}} {\text{PO}}_{\text{4}} \text{+}\text{9}{\text{SO}}_{4}^{2 -} \text{+}\text{38}\text{NO}
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