JEE Main 2017 · 9 Apr · Shift 1 · Chemistry Q47

ChemistrySingle correct+4 / -1Question 47 of 90

The number of P−OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid ( $\ce{H4P2O7}$ ) respectively are :

four and four

five and four

five and five

four and five

Answer and worked solution

Official answer: D

$\ce{(HO)2P(=O)-O-P(=O)(OH)2}$ has four P-OH bonds, and phosphorus is +5.

JEE Main 2017 · 9 Apr · Shift 1, Chemistry question 47