WAEC Chemistry 2022 Objective — Question 44
Question 44 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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Consider the following table: Substance | Melting point/°C | Boiling point/°C P | −78 | −25 Q | −8 | 40 R | −6 | 150 S | 44 | 280 Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?
- A. P
- B. QCorrect
- C. R
- D. S
Explanation
Since the boiling point of Q is 40°C, it will still remain in the liquid form at room temperature (25°C), but the air temperature can easily be raised to 40°C to cause it to evaporate — making Q a liquid that rapidly evaporates.
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