JAMB Chemistry 2023 Objective — Question 24

Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

A substance is said to be impure if

A. It is coloured
B. It has a low melting point
C. Its melting point range is wideCorrect
D. It is insoluble in water

Explanation

Pure substances have sharp, narrow melting point ranges. Impurities broaden and depress the melting point range. A wide melting range indicates impurity.

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