Liquid Test

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Liquid Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The magnitude of the surface tension of a liquid depends on:

A
Chemical composition of the molecules

B
Repulsive force between the molecules.

C
Attractive force between the molecules.

D
The third power of the distance between two interacting molecules

Solution

Surface tension depends on the attractive forces acting b/w molecules.
S = F/l
Question 2
1 / -0

Dry O₂ is:

A
Same as moist O₂

B
Lighter than moist O₂

C
Lighter than dry air

D
Heavier than moist O₂

Solution

The amount of water vapor in the air also affects the density. Water vapor is a relatively light gas when compared to diatomic Oxygen and diatomic Nitrogen. Thus, when water vapor increases, the amount of Oxygen and Nitrogen decrease per unit volume and thus density decreases because mass is decreasing.
Question 3
1 / -0

A student was given Water, Benzene, Orange juice, and Glycerol to pipette out in four different beakers. The liquid that will be relatively difficult to be sucked into the pipette will be:

A
Orange juice

B
Water

C
Benzene

D
Glycerol

Solution

Glycerol
The reason behind is that it is a viscous liquid.
Question 4
1 / -0

The mass of 112 ml of N₂ at STP on liquefaction is:

A
0.84 g

B
0.56 g

C
0.28 g

D
0.14 g

Solution

Number of moles when condition of STP is given by given volume divided by 22400 this will give number of moles and after that number of moles X molecular mass will give the mass of the given sample.
Question 5
1 / -0

Viscosity arises due to:

A
Kinetic energy of molecules of fluid

B
Density of fluid

C
Surface tension

D
Internal friction between layers of fluid

Solution

Viscosity is simply the frictional force that arises between adjacent layers of fluid that are in relative motion. Viscosity is a measurement of how resistant a fluid is to attempts to move through it.
Question 6
1 / -0

Which of the following sets consists of gases with same rate of diffusion:

A
CO₂, N₂O, C₃H₈

B
CO₂, NO₂, C₃H₈

C
H₂, D₂, He

D
N₂, CO₂, C₂H₄

Solution

Graham's law states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molar mass. r ∝ 1/√M.
In option A, all the compounds have the same mass(44g).
Question 7
1 / -0

The property of a liquid that increases with a increase in temperature is:

A
Viscosity

B
Vapour pressure

C
Surface tension

D
Both Viscosity and Surface tension

Solution

Vapour pressure is the only property which decreases with increase in temperature. A pure liquid experiences a greater amount of vapour pressure as against a liquid's solution. It is inversely proportional to the forces of attraction existing between the molecules of a liquid. It increases with a rise in the temperature. This is because the molecules gain kinetic energy and thus, vapourise briskly. On the other hand, with increase in kinetic energy of molecules, Viscosity and surface tension decreases.
Question 8
1 / -0

The S.I unit of Surface tension is:

A
Nms^-1

B
Nm^-1

C
Nm^-1s^-1

D
Nm²s^-1

Solution

S = F/l
So the SI unit of surface tension is Nm^-1
Question 9
1 / -0

The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be:

A
0.8 atm

B
0.4 atm

C
0.6 atm

D
0.2 atm

Solution

Vapour pressure will be the same because it doesn't depend on the volume. It depends only on temperature.
Question 10
1 / -0

Boiling is condition of:

A
Free vapourisation throughout the liquid

B
Restricted vapourisation throughout the liquid

C
Liquefaction of liquid

D
Increasing the density of the liquid

Solution

Boiling is the free vaporisation throughout the liquid. Every molecule of the sample has the same kinetic energy to dissociate from the liquid state. So this will result in free vapourisation.On the other hand, evaporation is restricted vaporisation throughout the liquid. As the molecules present on the surface only vaporises.

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Liquid Test - 4

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Liquid Test - 4

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Question 1

Chemical composition of the molecules

Repulsive force between the molecules.

Attractive force between the molecules.

The third power of the distance between two interacting molecules

Solution

Question 2

Same as moist O2

Lighter than moist O2

Lighter than dry air

Heavier than moist O2

Solution

Question 3

Orange juice

Water

Benzene

Glycerol

Solution

Question 4

0.84 g

0.56 g

0.28 g

0.14 g

Solution

Question 5

Kinetic energy of molecules of fluid

Density of fluid

Surface tension

Internal friction between layers of fluid

Solution

Question 6

CO2, N2O, C3H8

CO2, NO2, C3H8

H2, D2, He

N2, CO2, C2H4

Solution

Question 7

Viscosity

Vapour pressure

Surface tension

Both Viscosity and Surface tension

Solution

Question 8

Nms-1

Nm-1

Nm-1s-1

Nm2s-1

Solution

Question 9

0.8 atm

0.4 atm

0.6 atm

0.2 atm

Solution

Question 10

Free vapourisation throughout the liquid

Restricted vapourisation throughout the liquid

Liquefaction of liquid

Increasing the density of the liquid

Solution

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Same as moist O₂

Lighter than moist O₂

Heavier than moist O₂

CO₂, N₂O, C₃H₈

CO₂, NO₂, C₃H₈

H₂, D₂, He

N₂, CO₂, C₂H₄

Nms^-1

Nm^-1

Nm^-1s^-1

Nm²s^-1