Question

(d) neutralisation
OR
Mixing an acid or a base with water results in
(a) increase in temperature and pressure of acid or base.
(b) decrease in temperature of acid.
(c) decrease in concentration of hydronium ions.
(d) None of these.​

Answer 1

Answer:

Hi mate , your answer is c) Decrease in concentration of Hydronium Ions

Reason : During Neutralisation , base that also contains some hydrogen ions mixes with acids that already contains hydrogen ions . So As a result of this , Conc. of hydronium Ions Decreases.....

Thanks _____________:)

Answer 2

The answer is : (c)-decrease in concentration of hydronium ions

EXPLANATION:
when a base or acid is added to water the ions hydrogen ions combine with water molecules to form hydronium ions(H30) as hydrogen can’t exist alone. When an acid or base is added to water neutralisation takes place which leads to disposal of ions and thus decreasing the concentration of hydronium ions per unit volume.