Is Matter around Us Pure Test

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Is Matter around Us Pure Test - 3

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Question 1
1 / -0

Why is ink not heated directly while separating coloured components from it?

A
To prevent blackening of evaporating dish.

B
To save fuel used in burner.

C
To avoid decomposition of dye components.

D
To prevent breaking of evaporating dish.

Solution

If ink is heated directly at high temperatures, the dye may get decomposed.
Question 2
1 / -0

What is the basic principle behind simple distillation process?

A
Difference in boiling and melting points of two miscible liquids should be less than 30^oC.

B
The two liquids should be immiscible.

C
The two liquids should have molecular weight greater than 200 g/mol.

D
Sufficient difference in the boiling points of two miscible liquids and the two liquids should boil without decomposition.

Solution

Simple distillation is the process of separating components of mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points.
Question 3
1 / -0

Which one of the following scrap metals cannot be separated by magnetic separation?

A
Chromium

B
Steel

C
Nickel

D
Cobalt

Solution

Chromium does not have magnetic properties so it cannot be separated by magnetic separation.
Question 4
1 / -0

Which of the following is not true for a mixture?

A
A mixture can be separated into its constituents.

B
The composition of a mixture is variable.

C
Energy is not given out in the preparation of a mixture.

D
A mixture has a fixed melting point.

Solution

A mixture does not have a fixed melting point, boiling point etc. On the other hand, compounds have a fixed melting point, boiling point.
Question 5
1 / -0

What will you observe when a mixture of iodine and salt is heated in a china dish?

A
The mixture starts melting.

B
Salt is left behind in the china dish.

C
No change in the china dish is observed.

D
Iodine is left behind in the china dish.

Solution

Iodine sublimes on heating and salt will be left behind in the china dish.
Question 6
1 / -0

Which solvent can be used to obtain sodium chloride from a mixture of sodium chloride and sulphur without using water?

A
Kerosene

B
Sodium hydroxide

C
Sulphuric acid

D
Carbon disulphide

Solution

Carbon disulphide is a suitable solvent for sulphur. Sodium chloride remains undissolved and can be separated by filtration process.
Question 7
1 / -0

Which one of the following solvent is added to separate the mixture of sand and sulphur?

A
Water

B
Alcohol

C
Sulphuric acid

D
Carbon disulphide

Solution

Sulphur is soluble in carbon disulphide solution and sand remains undissolved and hence can be separated by filtration process.
Question 8
1 / -0

Which is the best method to separate the solute from a solution, when only solute is required?

A
Evaporation

B
Condensation

C
Distillation

D
Filtration

Solution

By evaporation technique, all the solvent gets evaporated and what remains is just the solute.
Question 9
1 / -0

Why do we separate ethyl alcohol and water by fractional distillation?

A
The difference in the boiling point of the liquids is less than 30^oC.

B
Because water is a universal solvent.

C
Because both of them are liquids.

D
All of the above

Solution

Fractional distillation is used to separate mixture in which constituent liquids have boiling point difference less than 30^oC. We can separate a mixture of ethyl alcohol and water by fractional distillation because boiling point of ethyl alcohol is 78.4^oC and that of water is 100^oC.
Question 10
1 / -0

Which of the following statements is correct?

A
A solution is a homogeneous mixture.

B
A suspension is a homogeneous mixture.

C
In a solution, the substance present in lesser quantity is called solvent.

D
In a solution, the substance present in greater quantity is called solute.

Solution

The statement "a solution is a homogeneous mixture" is correct, rest all the statements are incorrect.

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Is Matter around Us Pure Test - 3

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Question 1

To prevent blackening of evaporating dish.

To save fuel used in burner.

To avoid decomposition of dye components.

To prevent breaking of evaporating dish.

Solution

Question 2

Difference in boiling and melting points of two miscible liquids should be less than 30oC.

The two liquids should be immiscible.

The two liquids should have molecular weight greater than 200 g/mol.

Sufficient difference in the boiling points of two miscible liquids and the two liquids should boil without decomposition.

Solution

Question 3

Chromium

Steel

Nickel

Cobalt

Solution

Question 4

A mixture can be separated into its constituents.

The composition of a mixture is variable.

Energy is not given out in the preparation of a mixture.

A mixture has a fixed melting point.

Solution

Question 5

The mixture starts melting.

Salt is left behind in the china dish.

No change in the china dish is observed.

Iodine is left behind in the china dish.

Solution

Question 6

Kerosene

Sodium hydroxide

Sulphuric acid

Carbon disulphide

Solution

Question 7

Water

Alcohol

Sulphuric acid

Carbon disulphide

Solution

Question 8

Evaporation

Condensation

Distillation

Filtration

Solution

Question 9

The difference in the boiling point of the liquids is less than 30oC.

Because water is a universal solvent.

Because both of them are liquids.

All of the above

Solution

Question 10

A solution is a homogeneous mixture.

A suspension is a homogeneous mixture.

In a solution, the substance present in lesser quantity is called solvent.

In a solution, the substance present in greater quantity is called solute.

Solution

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Difference in boiling and melting points of two miscible liquids should be less than 30^oC.

The difference in the boiling point of the liquids is less than 30^oC.