question_answer 49)

    Which of the following phenomena occur, when a small amount of acid is added to water?                 (i) Ionisation                       (ii) Neutralisation                 (iii) Dilution                         (iv) Formation                 (a) (i)and(ii)                        (b) (i) and (iii)                     (c) (ii) and (iii)                    (d) (ii) and (iv)                  

Answer:

  B (i) When water is added to an acid, their molecules dissociate to form ions. (Hydronium ion) (iii) Mixing of an acid with water is called dilution, it results in the decrease in the concentration of ions, (') per unit volume.