Redox Reactions - Result Question 9

####9. The oxidation number of phosphorus in pyrophosphoric acid is

(a) +3

(b) +1

(c) +4

(d) +5

[1999]

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Solution:

  1. (d) Pyrophosphoric acid H4P2O7 Let oxidation state of phosphorus is x (4×1+(2)×7+2x)=0 2x=10 or x=+5


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