Question

Which of the following compound is a tribasic acid?

• A. $H_{3}P{O}_2$
• B. $H_{3}P{O}_4$
• C. $H_{3}P{O}_3$
• D. $H_4{P}_2{O}_7$

Answer 1

Answer: (B)

$H_{3}P{O}_4$ is a tetrahedral structure molecule. It contains three $-OH$ group so that three protons can be released. So it acts as a tribasic acid.