Question

Which of the following is tetrabasic acid?

• A. Orthophosphorus acid
• B. Orthophosphoric acid
• C. Metaphosphoric acid
• D. Pyrophosphoric acid

Answer 1

Answer: (D)

$H_4{P}_2{O}_7$ (pyrophosphoric acid) is tetrabasic because it gives four $H^{+}$ ions.