Question

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

• A. Pyrophosphorus acid
• B. Hypophosphoric acid
• C. Phosphoric acid
• D. Pyrophosphoric acid

Answer 1

Answer: (D)

Pyrophosphoric acid

Answer 2

$Pyrophosphorus \;acid → H_4P_2O_5$
$Hypophosphoric \;acid → H_4P_2O_6$
$Phosphoric \;acid → H_3PO_4$
$Pyrophosphoric \;acid → H_4P_2O_7$

The correct answer is (D): $Pyrophosphoric \;acid$