States of Matter: Gases and liquids Test

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States of Matter: Gases and liquids Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

In order to increase the volume of a gas by 10%, the pressure of the gas should be

A
decreased by 10%

B
decreased by 1%

C
increased by 10%

D
increased by 1%

Solution

According to Boyle's law,
pV = Constant
Or, p₁V₁ = p₂V₂
If V₂ = V₁ + V₁ x 10/100 = 1.1 V₁
P₂ = p₁V₁/V₂ = 0.9 p₁
The pressure should be decreased by 10%.
Question 2
1 / -0

What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15°C and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 atm?

A
Its volume will increase by a factor of 2.5.

B
Its volume will increase by a factor of 1.6.

C
Its volume will increase by a factor of 1.1.

D
Its volume will increase by a factor of 0.70.

Solution

p₁V₁/T₁ = p₂V₂/T₂
p₁ = 1.5 atm
T₁= 15°C = (15 + 273) K = 288 K
p₂ = 1.0 atm
T₂ = 25 + 273 = 298 K
Therefore, 1.5 x V₁/288 = 1 x V₂/298
V₂ = 1.6V₁
Question 3
1 / -0

Which of the following properties of water can be used to explain the spherical shape of rain droplets?

A
Viscosity

B
Surface tension

C
Critical phenomenon

D
Pressure

Solution

The drops acquire spherical shape to minimize the surface tension.
Question 4
1 / -0

Which of the following substances, when dissolved in water, increases the surface tension of water?

A
NaCl

B
Acetic acid

C
Acetone

D
Soap

Solution

Sodium chloride is more concentrated within the solution than at the surface of the solution. Such substances increase the surface tension.
Question 5
1 / -0

Choose the incorrect statement.

A
Surface tension is the force acting per unit length and is perpendicular to the line drawn on the surface of the liquid.

B
Surface tension of the liquid increases with increase in temperature.

C
The SI unit of surface tension is Jm^-2.

D
Viscosity is a measure of resistance to the flow of a liquid.

Solution

Surface tension of a liquid decreases with increase in temperature because of decrease in intermolecular forces of attraction.
Question 6
1 / -0

The surface tension of which of the following liquids is the maximum?

A
C₂H₅OH

B
CH₃OH

C
H₂O

D
C₆H₆

Solution

Surface tension is maximum in water due to strong intermolecular forces of attraction (hydrogen bonds) between the water molecules.

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States of Matter: Gases and liquids Test - 6

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States of Matter: Gases and liquids Test - 6

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Question 1

decreased by 10%

decreased by 1%

increased by 10%

increased by 1%

Solution

Question 2

Its volume will increase by a factor of 2.5.

Its volume will increase by a factor of 1.6.

Its volume will increase by a factor of 1.1.

Its volume will increase by a factor of 0.70.

Solution

Question 3

Viscosity

Surface tension

Critical phenomenon

Pressure

Solution

Question 4

NaCl

Acetic acid

Acetone

Soap

Solution

Question 5

Surface tension is the force acting per unit length and is perpendicular to the line drawn on the surface of the liquid.

Surface tension of the liquid increases with increase in temperature.

The SI unit of surface tension is Jm-2.

Viscosity is a measure of resistance to the flow of a liquid.

Solution

Question 6

C2H5OH

CH3OH

H2O

C6H6

Solution

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The SI unit of surface tension is Jm^-2.

C₂H₅OH

CH₃OH

H₂O

C₆H₆