WAEC Chemistry 2013 Objective — Question 31
Question 31 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.
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A substance is said to be impure if
- A. its melting point range is wideCorrect
- B. it dissolves in water with difficulty
- C. it has a low melting point
- D. it is coloured
Explanation
A solid is pure if it melts at a sharp temperature or over a narrow temperature range. When a solid melts over a wide range of temperature, it is impure.
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