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:
- (d) Pyrophosphoric acid $H_4 P_2 O_7$ Let oxidation state of phosphorus is $x$ $(4 \times 1+(-2) \times 7+2 x)=0$ $\therefore 2 x=10$ or $x=+5$
