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.
