Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a heterogeneous mixture ?

A
Air

B
Rain

C
Steel

D
Soil

Solution

Air, rain and steel are all homogenous mixtures.
Soil is a heterogenous mixture of solids.
Question 2
1 / -0

The mixture of oil and water is :

A
homogenous mixture

B
heterogenous mixture

C
pure mixture

D
none of above

Solution

When oil and water are combined, they do not mix evenly, but instead form two separate layers. So, it is a heterogeneous mixture. Homogenous mixtures have uniform composition and they do not separate out into different layers. Mixtures are not pure substances. Hence option B is correct.
Question 3
1 / -0

Which of the following is not heterogeneous?

A
Jelly

B
Milk

C
Steel

D
Smoke

Solution

Steel is a homogeneous mixture. It is an alloy of iron and carbon and has a uniform composition throughout. Jelly, milk and smoke are colloids, and colloids are heterogeneous mixtures. They do not have a uniform composition.
Question 4
1 / -0

Air is:

A
a pure substance

B
a mixture

C
a compound

D
an element

Solution

Air is a mixture of different elements (made of one type of atom, e.g. oxygen $$O_2$$, nitrogen $$N_2$$, etc.) and compounds (made of different atoms, e.g. water vapour $$H_2O$$). It is not a pure substance because its constituents can be easily separated and its composition can vary.
Question 5
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Which of the following mixtures cannot be separated by using a separating funnel?

A
Kerosene oil and water

B
Ethyl alcohol and water

C
Turpentine oil and water

D
Benzene and water

Solution

Ethyl alcohol and water are two miscible liquids. This mixture of ethyl alcohol and water can be separated by using the distillation method. Distillation is a process that can be used to separate a pure liquid from a mixture of liquids.

A separating funnel can be used to separate the components of the mixture of immiscible liquids. All other options are of immiscible liquids.

Option $$B$$ is correct.
Question 6
1 / -0

Four alternatives are given to each of the following incomplete statements questions.
Choose the right answer.
Which of the following is not a pure substance

A
Common salt

B
sugar

C
Rain water

D
Iron

Solution

Common salt, sugar, and iron are pure substances but rainwater is not pure.
Rainwater consists of several gases like carbon dioxide, oxygen, oxides of nitrogen, and sulphur. It also contains dust particles hence rainwater is not a pure substance.
Question 7
1 / -0

Which of the following is the universal solvent?

A
Water

B
Petrol

C
Benzene

D
Alcohol

Solution

Water dissolves a large number of substances in it, so it is called a universal solvent.
Question 8
1 / -0

Which of the following method used to separate two immiscible liquids?

A
Separation funnel

B
Sieving

C
Winnowing

D
Sublimation

Solution

Depending upon the properties of liquids, they can be separated by different methods. In general liquids, solutions are described in two ways, miscible and immiscible.
Immiscible liquids are separated by using a separating funnel. These liquids have a boundary between them or they are present one over the other due to differences in density. Liquid with high density stays at the bottom and can be separated out.
Sieving, winnowing and sublimation involves solids mixtures.
Hence, option $$A$$ is correct.
Question 9
1 / -0

Which method is commonly used to separate salt from water?

A
Sedimentation

B
Filteration

C
Evaporation

D
Condensation

Solution

For the separation of solid dissolved in a liquid, evaporation can be used as a separation technique.
So, the technique used for the separation of salt from its solution is evaporation.
Question 10
1 / -0

Method for separating drugs (medicine) which are miscible in blood

A
Distillation

B
Sublimation

C
Using separating funnel

D
Chromatography

Solution

Chromatography is used for separating drugs (medicine) that are miscible in blood.

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Is Matter Around Us Pure Test - 71

Result

Is Matter Around Us Pure Test - 71

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SHARING IS CARING

Question 1

Air

Rain

Steel

Soil

Solution

Question 2

homogenous mixture

heterogenous mixture

pure mixture

none of above

Solution

Question 3

Jelly

Milk

Steel

Smoke

Solution

Question 4

a pure substance

a mixture

a compound

an element

Solution

Question 5

Kerosene oil and water

Ethyl alcohol and water

Turpentine oil and water

Benzene and water

Solution

Question 6

Common salt

sugar

Rain water

Iron

Solution

Question 7

Water

Petrol

Benzene

Alcohol

Solution

Question 8

Separation funnel

Sieving

Winnowing

Sublimation

Solution

Question 9

Sedimentation

Filteration

Evaporation

Condensation

Solution

Question 10

Distillation

Sublimation

Using separating funnel

Chromatography

Solution

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