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.

answer: mercury

explanation:

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.