A) + 5
B) + 3
C) + 4
D) + 1
Correct Answer: A
Solution :
Pyrophosphoric acid is \[\overset{+1}{\mathop{{{H}_{4}}}}\,\overset{x}{\mathop{{{P}_{2}}}}\,\overset{-2}{\mathop{{{O}_{7}}}}\,\] \[(+1\times 4)+2x+(-2\times 7)=0\] \[+\,\,4+2x-14=0\] \[2x=14-4\] \[2x=10\] \[x=+\,\,5\]
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