Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

What is the principle of crystallisation?

A
Differences in densities of the components is used for separation.

B
Differences in boiling point of the components is used for separation.

C
Differences in solubilities of the components is used for separation

D
None of these

Solution

The crystallization separates the components of a mixture based on the differences in solubilities at different temperatures. The solid is dissolved in a hot solvent and then cooled. On cooling, pure crystals solidify but impurities remain in the solution and are separated from the solid. Thus in the process of cyrstallisation, densities or boiling point is not used instead, differences in solubilities are used for separation. Hence option C is correct.
Question 2
1 / -0

A glass of iced tea is a/an:

A
homogeneous mixture

B
heterogeneous mixture

C
compound

D
element

Solution

A glass of iced tea is a heterogeneous mixture as it contains both solid and liquid phases simultaneously.
Question 3
1 / -0

Baking soda is an example of pure substance because:

A
the constituent particles have constant composition.

B
it has consistent properties through out the mixture.

C
both A and B

D
none of these

Solution

Baking soda is a chemical compound having structural formula ( $$NaHCO_3$$ ) that contains the same composition of constituent particles which are consistent throughout the mixture. Hence, it is a pure substance.
Question 4
1 / -0

Elements and compounds are the type of ___________.

A
Pure substance

B
Impure substance

C
Both a and b

D
None of these

Solution

Substances are classified into elements and compounds which further classified into molecule and atoms. Elements and compound are pure substances as they contain the same composition throughout.

Hence, the correct option is $$A$$
Question 5
1 / -0

Usually crystals are dried with help of ________.

A
dryer

B
autoclave

C
filter paper

D
fan

Solution

Usually crystals are dried with help of filter paper.
The moisture present in the crystals is absorbed by filter paper.
Question 6
1 / -0

Fractional distillation is performed on which of the following?

A
liquid air

B
gaseous air

C
both a and b

D
none of these

Solution

The fractional distillation process is used for the separation of components of a mixture containing two or more miscible liquids when the difference in their boiling points is less than $$25 K$$.

Air is a homogeneous mixture of gases and can be separated into its components by fractional distillation in its liquid form only. It is compressed by increasing the pressure and is then cooled by decreasing the temperature to get liquid air. This liquid air is allowed to warm up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points.
Question 7
1 / -0

On separation of oxygen gas from air, its percentage obtained is ______________.

A
25%

B
20.9%

C
17%

D
None of these

Solution

Fractional distillation of air produces $$20.9$$% of oxygen gas. Its boiling point is $$−183^{\circ}C$$.
Question 8
1 / -0

Air is to convert into liquid air by __________.

A
increasing pressure

B
decreasing temprature

C
Both A and B

D
None of these

Solution

In the separation procedure of different gases from air, its pressure is increased and temperature is reduced so that it get converted into liquid air.
Question 9
1 / -0

% by volume of argon gas produced on fractional distillation of air is _____________.

A
0.9%

B
0.145%

C
0.23%

D
None of these

Solution

Fractional distillation of air finally produces $$0.9$$% of argon gas. Its boiling point is $$-186^{\circ}C$$.
Question 10
1 / -0

Pure substances always have fixed ________.

A
Chemical formula

B
Pressure

C
Volume

D
Temperature

Solution

A pure substance is that which contain one kind of molecule. They have fixed chemical formula. Like water is a pure substance with chemical formula $$H_2O$$.

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Is Matter Around Us Pure Test - 59

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Is Matter Around Us Pure Test - 59

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Question 1

Differences in densities of the components is used for separation.

Differences in boiling point of the components is used for separation.

Differences in solubilities of the components is used for separation

None of these

Solution

Question 2

homogeneous mixture

heterogeneous mixture

compound

element

Solution

Question 3

the constituent particles have constant composition.

it has consistent properties through out the mixture.

both A and B

none of these

Solution

Question 4

Pure substance

Impure substance

Both a and b

None of these

Solution

Question 5

dryer

autoclave

filter paper

fan

Solution

Question 6

liquid air

gaseous air

both a and b

none of these

Solution

Question 7

25%

20.9%

17%

None of these

Solution

Question 8

increasing pressure

decreasing temprature

Both A and B

None of these

Solution

Question 9

0.9%

0.145%

0.23%

None of these

Solution

Question 10

Chemical formula

Pressure

Volume

Temperature

Solution

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