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The conjugate acid of HS is.
A. S2.
B. H2S.
C. Both A and B.
D. None of the above.

Answer
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Hint: We know that the Bronsted-Lowry theory of acid and base. According to this theory an acid is a proton donor while the base is a proton acceptor. The proton is represented by the symbol H+ and we know that the conjugate acid is a cation and conjugate base is an anion.

Complete step by step answer: The Bronsted-Lowry theory is based on an acid and base reaction.
We know that, an acid is a species which has the capacity of donating a proton that is hydrogen ion is called Bronsted-Lowry acid and a base is species which has the capacity of accepting proton and a base it needs to have a lone pair of electrons on the base which bonds to the hydrogen ion.
Now, we see Conjugate acid.
According to Bronsted-Lowry theory the conjugate acid is the chemical species which is formed after the base accepts the hydrogen atom is called conjugate acid.
Acid+BaseConjugateBase+ConjugateAcid
Apply the Bronsted-Lowry theory to find the conjugate acidHS.
Hydrogen sulfuric acid dissociated into hydrogen sulfate ion. The conjugate acid of the hydrogen sulfate ion is the hydrogen sulfuric acid.
HS(aq)+H2O(l)H2S(aq)+OH(aq)
In the above reaction HS acts as Bronsted-Lowry base which accepts hydrogen atom from its conjugate acidH2S.

So, the correct answer is “Option B”.

Note: We must know that a conjugate acid contains one hydrogen atom in addition and positive charge than the base from which is formed. A conjugate base has one hydrogen atom less and negative charge than the acid from which it is formed.
Example: Carbonic acid and hydronium ions are formed by the reaction of bicarbonate ions with the water.