question_answer

The number of \[P-OH\] bonds and the oxidation state of phosphorus atom in pyrophosphoric acid \[({{H}_{4}}{{P}_{2}}{{O}_{7}})\] respectively are:

A) four and four    

B) five and four

C) five and five      

D) four and five

Correct Answer: D

Solution :

[d] Oxidation State: Each P atom is bound to one oxygen \[=-1\] \[2OH=-1\times 2=-2\] \[1\text{ }Oxygen=-2\] \[Total=-5\] P=+5.