Post-UTME Chemistry 2012 Objective — Question 4

Question 4 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

Which of the following substances has the lowest vapour density? (O=16, Cl=35.5, H=1, C=12)

A. ethanoic acid
B. propanol
C. dichloromethane
D. ethanolCorrect

Explanation

Vapour density = molar mass/2. Ethanol (molar mass 46) has the lowest molar mass among those listed, giving the lowest vapour density. (No printed answer key for this session; answer worked out independently.)

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