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WAEC Chemistry 2022 Paper

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Question : 43

Total: 50

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?

P
Q
R
S

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