Question

Give one example of a substance which contains: (i) ions only, (ii) molecules only, (iii) both ions and molecules.

Answer 1

Disclaimer: Any one of the mentioned substance can be used to answer the given question.
Examples are:
(i) ions only - Strong electrolytes, such as dil. hydrochloric acid (HCl), sodium hydroxide (NaOH), sodium acetate (CH₃COONa), dil. sulphuric acid (H₂SO₄) etc.
(ii) molecules only - Non-electrolytes, such as urea (NH₂CONH₂), glucose (C₆H₁₂O₆), carbon tetrachloride (CCl₄), distilled water (H₂O) etc.
(iii) both ions and molecules - Weak electrolytes, such as acetic acid (CH₃COOH), ammonium hydroxide (NH₄OH), ammonia (NH₃), carbonic acid (H₂CO₃) etc.