Is Matter around Us Pure Test

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Is Matter around Us Pure Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following reactions involve a chemical change?

A
Copper metal drawn into wires

B
Weathering of rocks

C
Freezing of water

D
Ripening of fruits

Solution

Ripening of fruits is a chemical change.
Question 2
1 / -0

What is the basic principle behind fractional distillation?

A
The difference in boiling points of two or more miscible liquids is less than 30^oC.

B
Difference in the boiling points of the miscible liquids should be 30^oC or more.

C
Difference in the molecular weight of two or more miscible liquids should be 50g/mol.

D
The liquids should decompose during the process of fractional distillation.

Solution

Fractional distillation is used to separate a mixture of two or more miscible liquids which boil without decomposition and for which the difference in boiling points is less than 30^oC.
Question 3
1 / -0

In cities, gutter water is filtered through

A
Coarse sand layer

B
Sedimentation tank

C
Special water filters

D
Metallic filters

Solution

In cities, gutter water is filtered through big metallic filters to separate solid materials present in it.
Question 4
1 / -0

Name the solvent which is known as universal solvent.

A
Ethanol

B
Vinegar

C
Water

D
Benzene

Solution

Water is known as the universal solvent.
Question 5
1 / -0

In a chromatographic technique, a sample whose components need to be separated is placed

A
At the bottom of the filter paper.

B
About 2-3 cm from bottom of the filter paper.

C
About 2-3 cm from top of the filter paper.

D
At the top of the filter paper.

Solution

In chromatographic technique, a sample whose components need to be separated is placed about 2-3 cm from bottom of the filter paper.
Question 6
1 / -0

Which of the following involves physical change?

A
Grinding

B
Tearing

C
Cutting

D
All of the above

Solution

Grinding, tearing, cutting are examples of physical changes. There is no change in the chemical composition in these processes.
Question 7
1 / -0

The separation of two immiscible liquids by a separating funnel depends upon

A
The difference in their boiling points.

B
The difference in their melting points.

C
The difference in their colours.

D
The difference in their densities.

Solution

The separation of two immiscible liquids by a separating funnel depends upon the difference in their densities.
Question 8
1 / -0

Which method is used to separate cream from milk?

A
Crystallization

B
Centrifugation

C
Adsorption

D
Distillation

Solution

Centrifugation technique is used to separate components of a milk (mixture) having different densities.
Question 9
1 / -0

Boiling point of liquid A is 25^oC and that of liquid B is 40^oC. Which technique will you use to separate these miscible liquids?

A
Simple distillation

B
Fractional distillation

C
Centrifugation

D
Using a separating funnel

Solution

The given liquids A and B are miscible. Also, the temperature difference between the Liquid A and B is less than 25^oC. Thus, fractional distillation method is used.

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Re-Attempt Weekly Quiz Competition

Is Matter around Us Pure Test - 2

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Is Matter around Us Pure Test - 2

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SHARING IS CARING

Question 1

Copper metal drawn into wires

Weathering of rocks

Freezing of water

Ripening of fruits

Solution

Question 2

The difference in boiling points of two or more miscible liquids is less than 30oC.

Difference in the boiling points of the miscible liquids should be 30oC or more.

Difference in the molecular weight of two or more miscible liquids should be 50g/mol.

The liquids should decompose during the process of fractional distillation.

Solution

Question 3

Coarse sand layer

Sedimentation tank

Special water filters

Metallic filters

Solution

Question 4

Ethanol

Vinegar

Water

Benzene

Solution

Question 5

At the bottom of the filter paper.

About 2-3 cm from bottom of the filter paper.

About 2-3 cm from top of the filter paper.

At the top of the filter paper.

Solution

Question 6

Grinding

Tearing

Cutting

All of the above

Solution

Question 7

The difference in their boiling points.

The difference in their melting points.

The difference in their colours.

The difference in their densities.

Solution

Question 8

Crystallization

Centrifugation

Adsorption

Distillation

Solution

Question 9

Simple distillation

Fractional distillation

Centrifugation

Using a separating funnel

Solution

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The difference in boiling points of two or more miscible liquids is less than 30^oC.

Difference in the boiling points of the miscible liquids should be 30^oC or more.