Question

The number of $P-OH$ bonds and the oxidation state of phosphorus atom in pyrophosphoric acid $\left(H_4{P}_2{O}_7\right)$ respectively are :

• A. Four and five
• B. Four and four
• C. Five and five
• D. Five and four

Answer 1

The correct option is A Four and five

The number of $P-OH$ bonds in $\text{pyrophosphoric acid}$ $\left(H_4{P}_2{O}_7\right)$ is four.

The oxidation state of the phosphorus atom in $H_4{P}_2{O}_7$,

$\Rightarrow 4\times 1+2x-2\times 7=0$

$\Rightarrow x=+5$

Hence, option $A$ is correct.