WAEC Chemistry 2018 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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Common salt (NaCl) is used for preserving foods. Which of the following properties could be used to determine its purity before use?
- A. solubility in water
- B. melting pointCorrect
- C. relative density
- D. crystalline nature
Explanation
The purity of a solid such as NaCl can be assessed by its melting point — a pure sample melts sharply at a known temperature, while an impure one melts over a range.
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