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The element or the compound that donates protons or hydrogen to others and forms a conjugate base is called Bronsted-Lowry acid. The conjugate acid is [tex]\rm H_{2}CO_{3}[/tex].
What is a conjugate acid?
According to Bronsted-Lowry, acids donate and the bases accept a proton or an electron. The reaction is shown as,
[tex]\rm HCO_{3}^{-} + H_{2}S \rightarrow H_{2}CO_{3} + HS^{-}[/tex]
In an acid-base reaction, the element that is formed when the base accepts the proton or the hydrogen is called conjugate acid.
From the reaction, it can be said that carbonic acid is the conjugate acid as it is formed when bicarbonate accepts hydrogen or proton.
Therefore, option d. [tex]\rm H_{2}CO_{3}[/tex] is a conjugate acid.
Learn more about conjugate acid here:
https://brainly.com/question/11855180
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