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Consider the following table

Consider the following table

Substitute Meltig point / ºC Boiling  point / ºC
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.

Q

C.

R

D.

S

View answer & explanation

Correct answer is B

Q has slightly lower boiling point which when expose to air may evaporate rapidly.

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