Question

The monoprotic acid from among the following is
a. H2CO3.
b. H2SO4.
c. H3PO4.
d. HCl.

Answer 1

Monoprotic acid are acids having only one hydrogen atoms after dissociation into ions from its compound. The monoprotic acid from among the following is HCl. The answer is letter D. HCl → H+ + Cl-. Note that there is only one H+ ion upon dissociation.

Answer 2

Answer: Option (d) is the correct answer.

Explanation:

An acid which gives only one hydrogen ion or $H^{+}$ ions upon dissociation in an aqueous solution is known as a monoprotic acid.

Whereas when an acid gives two hydrogen or $H^{+}$ ions upon dissociation in an aqueous solution is known as a diprotoc acid.

And when an acid gives three hydrogen or $H^{+}$ ions upon dissociation in an aqueous solution is known as a triprotoc acid.

Therefore dissociation of the given acids in an aqueous solution will be as follows.

  $H_{2}CO_{3} \rightarrow 2H^{+} + CO^{2-}_{3}$

  $H_{2}SO_{4} \rightarrow 2H^{+} + SO^{2-}_{4}$

  $H_{3}PO_{4} \rightarrow 3H^{+} + PO^{2-}_{4}$

  $HCl \rightarrow H^{+} + Cl^{-}$

Hence, we can conclude that out of the given options, HCl is the monoprotic acid.