Boiling Point Flashcards

1
Q

On increasing the temperature of a liquid, its vapour pressure ____________
a) Decreases
b) Remain constant
c) Increases
d) None of the mentioned

A

c) Increases

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2
Q

The boiling point of a liquid is the temperature at which the vapour pressure
____________
a) Is equal to the internal pressure
b) Is equal to the external pressure
c) Is greater than an internal pressure
d) Is lesser than an internal pressure

A

b) Is equal to the external pressure

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3
Q

The normal boiling point of a liquid is the temperature at which it boils when the
external pressure is ____________
a) 1 atm
b) 2 atm
c) 3 atm
d) 5 atm

A

a) 1 atm

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4
Q

If the non-volatile impurities contaminate the liquid, its boiling point gets
____________
a) Depressed
b) Elevated
c) Remains same
d) None of the mentioned

A

b) Elevated

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5
Q

The energy required to vaporize 1 mole of a liquid is known as ____________
a) Molar heat of fusion
b) Molar heat of freezing
c) Molar heat of boiling
d) Molar heat of vaporization

A

d) Molar heat of vaporization

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6
Q

At 1 atm pressure, the boiling point of water is ____________
a) 0 0C
b) 1000C
c) -1000C
d) None of the mentioned

A

b) 100 deg C

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6
Q

The boiling point and molar heat of vaporisation is dependent on ____________
a) Strength of the inter-molecular forces
b) Composition of the liquid compound
c) Size of the molecules
d) All of the mentioned

A

a) Strength of the inter-molecular forces

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7
Q

Select the incorrect statement from the following options.
a) Methane and argon have weak dispersion forces so their boiling point is low
b) Diethyl ether has a dipole moment, and the dipole-dipole forces accounts for
its moderately high boiling point
c) Water and ethanol have strong hydrogen bonding and hence they possess
high boiling point
d) Mercury has weak metallic bonding which is responsible for its low boiling
point

A

d) Mercury has weak metallic bonding which is responsible for its low boiling
point

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8
Q

For a given substance, choose the correct statement.
a) ΔHfus is greater than ΔHvap
b) ΔHfus is equal to ΔHvap
c) ΔHfus is smaller than ΔHvap
d) None of the mentioned

A

c) ΔHfus is smaller than ΔHvap

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9
Q

The molar heat of vaporisation (ΔHvap) for water is ____________
a) 40.79 kJ/mol
b) 31.0 kJ/mol
c) 59.0 kJ/mol
d) 9.2 kJ/mol

A

a) 40.79 kJ/mol

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