Is Matter Around Us Pure Test

Result

Is Matter Around Us Pure Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

While separating oil and water, which component forms the upper layer?

A
Oil

B
Water

C
Both A and B

D
Air

Solution

Oil being lighter than water forms the upper layer and water forms the lower layer.
Question 2
1 / -0

In distillation process, vapours formed gives :

A
impurity

B
pure liquid

C
water

D
none of the above

Solution

The impure liquid is boiled and the vapours thus, formed are condensed to get the pure liquid.
Question 3
1 / -0

Air can be separated into its components by :

A
crystallisation

B
fractional distillation

C
sedimentation

D
none of the above

Solution

Air is a homogeneous mixture of different gases. The gaseous mixture cannot be separated by crystallisation or sedimentation. But it can be separated by fractional distillation. In this method, the air is first liquified and then passed through the fractionating column. In the fractionating column, the lower part is warm and each liquified gas starts to separate at its respective boiling temperature.
Question 4
1 / -0

Air is a ______ mixture.

A
homogeneous

B
heterogeneous

C
both A and B

D
none of the above

Solution

Air is a homogeneous mixture of gases.
Question 5
1 / -0

Distillation is used for liquids having:

A
volatile impurities

B
non-volatile impurities

C
both A and B

D
none of the above

Solution

Distillation is used for the purification of liquids that boil without decomposition and are associated with non-volatile impurities.
Question 6
1 / -0

Two main constituents of air are:

A
oxygen and nitrogen

B
carbon dioxide and nitrogen

C
rhodium and nitrogen

D
oxygen and calcium

Solution

Air is a homogeneous mixture of a number of gases. It's two main constituents are oxygen and nitrogen gas. Other gases are present in small quantities.
Question 7
1 / -0

In a solution of ethyl alcohol in water,

A
ethyl alcohol is the solute and water is the solvent.

B
water is the solute and ethyl alcohol is the solvent.

C
ethyl alcohol acts as both solute and solvent.

D
All of the above

Solution

The component present in large amount in a solution is called solvent. So, water is the solvent. The component which is present in small amount is the solute. So, ethyl alcohol is the solute.

Moreover, when we write a solution of 'X' in 'Y', it generally means 'X' is the solute and 'Y' is the solvent.
Question 8
1 / -0

The substance in which solute is dissolved is known as :

A
solution

B
solvent

C
dispersed phase

D
none of the above

Solution

A solution is obtained when a substance is dissolved in another substance. The substance in which solute is dissolved is known as a solvent.
Question 9
1 / -0

Process used for separating two miscible liquids that boil without decomposition and have sufficient difference in their boiling point is:

A
centrifugation

B
distillation

C
chromatography

D
All of the above

Solution

Distillation is very often used for separating liquid mixtures by selective boiling and condensation. The components should boil without decomposition and have sufficient difference in their boiling points.
Question 10
1 / -0

The composition of a mixture can not be seen even under a powerful microscope. Then the given mixture is ____________.

A
homogeneous

B
heterogeneous

C
both A and B

D
none of these

Solution

Homogeneous mixtures have the same composition throughout the sample. The components of a mixture can not be seen even under a powerful microscope.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 21

Result

Is Matter Around Us Pure Test - 21

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SHARING IS CARING

Question 1

Oil

Water

Both A and B

Air

Solution

Question 2

impurity

pure liquid

water

none of the above

Solution

Question 3

crystallisation

fractional distillation

sedimentation

none of the above

Solution

Question 4

homogeneous

heterogeneous

both A and B

none of the above

Solution

Question 5

volatile impurities

non-volatile impurities

both A and B

none of the above

Solution

Question 6

oxygen and nitrogen

carbon dioxide and nitrogen

rhodium and nitrogen

oxygen and calcium

Solution

Question 7

ethyl alcohol is the solute and water is the solvent.

water is the solute and ethyl alcohol is the solvent.

ethyl alcohol acts as both solute and solvent.

All of the above

Solution

Question 8

solution

solvent

dispersed phase

none of the above

Solution

Question 9

centrifugation

distillation

chromatography

All of the above

Solution

Question 10

homogeneous

heterogeneous

both A and B

none of these

Solution

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