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Elevation in Boiling Point

Substances th...

Question

Substances that do not vapourise easily are called non-volatile substances. When these are dissolved in a liquid like benzene, it:

A

Freezes

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B

Boils at a lower temperature

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C

Boils at a higher temperature

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D

Increases in volume

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Solution

The correct option is A Boils at a higher temperature
The mixture boils at high temperature due to rise in boiling point. Due to decrease in vapour pressure from solvent more energy is required to increase vapour pressure back to atmospheric pressure.

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Q. Boiling point of benzene is

353.23

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g of benzene. Then boiling point raised to

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2.67 K . k g . m o l^{- 1}

y

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Q. Question 16
Fill in the blanks in the following sentences.
(a) A ____________ process in which a substance reacts with __________ to give off heat is called combustion.

(b) When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire.

(c) The __________ temperature at which a substance catches fire is called its ignition temperature.

(d) The substances which have very ________________ ignition temperature and can easily catch fire with a flame are called __________ substances.

(e) The substances which vapourise during __________, give flame.

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