Apure substance has a boiling point of 80°c at 300 torr and 120°c at 600 torr. which of the following statements is true for this substance?
(1) its normal boiling point is below 80°c.
(2) its normal boiling point is above 120°c.
(3) it is stable as a liquid at 80°c and 200 torr.
(4) it is stable as a liquid at 200°c and 600 torr.
(5) none of the above statements are true.

(2) Its normal boiling point is above 120°C.

Explanation:

Normal boiling temperature is the temperature at which a substance boils in the atmospheric pressure.

atmosphere pressure is 760 torr.

Clearly, foe this substance increasing the pressure, its B.P. is increases, so at 760 torr, its normal boiling point should be greater than 120° C

(2) Its normal boiling point is above 120°C.