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