Question

The monobasic acid among the following is:

• A. $H_3{PO}_3$
• B. $H_2{S}_2{O}_7$
• C. $H_3{PO}_2$
• D. $H_2{P}_2{O}_7$

Answer 1

The correct option is C $H_3{PO}_2$

ACIDS	STRUCTURE
$H_{3}P{O}_3$ (it is dibasic acid since it can release 2 hydrogen ions)
$H_2{S}_2{O}_7$ (it is a dibasic acid since it can release 2 hydrogen ions )
$H_{3}P{O}_2$ (it is a monobasic since it can release one hydrogen ion)
$H_2{P}_2{O}_7$ (it is a dibasic since it can release two hydrogen ions)

Hence, from the above structures it is clear that $H_{3}P{O}_2$ is a monobasic acid since it can release only one hydrogen ion.

Thus, the correct answer is option (C).