Question

Which of the following phenomena occur, when a small amount of acid is added to water?
(i) Ionisation
(ii) Neutralisation
(iii) Dilution
(iv) Salt formation

• A. (i) and (ii)
• B. (i) and (iii)
• C. (ii) and (iii)
• D. (ii) and (iv)

Answer 1

Answer: (C)

(ii) and (iii)

Adding an acid to water decreases the extent to which water dissociates and leads to decrease in the concentration of hydroxide ions and increase in concentration of hydronium ions.
$2H_{2}O\left(l\right)\rightleftharpoons H_3{O}^{+}+{OH}^{-}$
So it leads to neutralisation and ionisation reactions.