Which of the following compound is tribasic acid?

Options

A. `H_(3)PO_(2)`
B. `H_(3)PO_(4)`
C. `H_(3)PO_(3)`
D. `H_(4)P_(2)O_(7)`

Answer

B

Explanation

`H_(3)PO_(4)` is a tetrahedral structure melecule . It contains three -OH group so that three protons can be released . So it acts as a tribasic acid .