Hclo3 + nh3 --> nh4^+ + clo3^- which of the following is a base–conjugate acid pair?
h2o and h3o+
h2o and h2po4–
h2po4– and hpo42–
h2po4– and h3o+

Explanation:

According to Bronsted-Lowry, acids are the species that give hydrogen ions whereas bases are the species that accept hydrogen ions.

A base on accepting a hydrogen ion results in the formation of conjugate acid. On the  other hand, an acid on donating hydrogen ion results into the formation of a conjugate base.

For example,

Here, is the acid, is the base, is the conjugate acid and is the conjugate base.

Therefore, we can conclude that in the given chemical reaction and is the base-conjugate acid pair.

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