Question

Select the correct answer from the choices a. b, c and d which are given.
Write only the letter corresponding to the correct answer.
(i) A particular solution contains molecules and ions of the solute so it is a
(a) weak acid
(b) strong acid
(c) strong base
(d) salt solution

(ii) An organic weak acid is
(a) Formic acid
(b) Sulphuric acid
(c) Sulphuric base
(d) Hydrochloric acid

(iii) An example of a complex salt is
(a) Zinc sulphate
(b) Solution hydrogen sulphate
(c) Iron (II) ammonium sulphate
(d) Tetramine copper (II) sulphate

Answer 1

(i) (a) weak acid
Weak acids, which are partially ionised in water, contain solute molecules in addition to water molecules.

(ii) (a) Formic acid
Formic acid is a weak organic acid, as it partially ionises and contains both molecules and ions. Other examples of weak organic acids are acetic acid and oxalic acid.

(iii) (d) Tetraaminecopper (II) sulphate
It is a complex salt with formula $\left[\mathrm{Cu}\right({\mathrm{NH}}_3{)}_4]{\mathrm{SO}}_4$.