Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 42

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Question 1
1 / -0

Colloid is a:

A
homogeneous mixture

B
heterogeneous mixture

C
supersaturated solution

D
none of the above
Solution
$$\bf{Hint:}$$ A heterogeneous mixture do not have uniform concentration throughout the mixture.

$$\bf{Correct \ answer:}$$ Option $$B$$

$$\bf{Explanation \ for \ correct \ option:}$$

A colloid has an intermediate size of particles between those of a suspension and a solution. In other words, colloids are solution in which the size of the particles of the solute is $$1\,nm - 1000\,nm$$. Due to this size differences, the composition of colloids is not uniform throughout, hence is considered as a heterogeneous mixture.

$$\bf{Explanation \ for \ incorrect \ options:}$$
A homogenous mixture is a mixture in which the components mix with each other and its composition is uniform throughout the solution. As the composition of colloids is not uniform throughout, therefore it is an incorrect option.

A supersaturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature but there are no such maximum particles present in colloid, hence it is also incorrect.
Question 2
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Mark the correct statement(s).
(I) The solute particles settle down when suspension is left undisturbed.
(II) Particles of a suspension scatter a beam of light passing through it and makes its path visible.
(III) Suspension is a homogeneous mixture.

A
I, II

B
II, III

C
I, III

D
I, II, III

Solution

The particles of a suspension can be seen by naked eyes. Solute particles settle down when left undisturbed. Larger particles in a suspension can be separated from the liquid or air by filtration. Suspension is a heterogeneous mixture.
Question 3
1 / -0

Suspension is a non-homogeneous mixture in which very fine particles of .................. are dispersed in .................

A
solid/liquid, gas/solid

B
gas, liquid

C
solid, liquid/gas

D
solid/liquid/gas, liquid

Solution

A suspension is a heterogeneous mixture in which very fine particles of a solid dispersed in any medium (liquid/gas). In any suspension, fine particles of the solid remain suspended in the medium.
Question 4
1 / -0

Crystallisation is better than simple evaporation because :

A
solid obtained after evaporation contains impurities

B
some solids decompose on heating

C
both A and B

D
none of the above

Solution

During evaporation, the liquid gets evaporated, and the solid particles are left behind. The solid obtained after evaporation has many impurities. To remove the impurities present in the solid, it is crystallized. By crystallisation, pure crystals of solid are obtained.
Another important point is evaporation requires heating, and all substances can not withstand the heat treatment. For example, the sugar solution on heating to dryness will get charred. But this problem does not arise in the case of the crystallisation method. So, crystallisation is better than evaporation.
Question 5
1 / -0

Pure solid can be obtained from its impure sample by the process of:

A
sedimentation

B
crystallisation

C
filtration

D
decantation

Solution

Pure solids can be obtained from their impure sample by crystallisation.
Crystallisation is used to purify solids.

All the other processes mentioned in the options i.e. sedimentation, filtration and decantation are done to free a liquid from solid contaminants and thus obtain its decontaminated form.
Question 6
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Which of the following method is generally employed to separate the components of a solid-liquid suspension?

A
chromatography

B
filtration

C
handpicking

D
None of the above

Solution

The solid particles in a suspension are large and settle down when left undisturbed. When passed through a filter paper, the solid residue of a suspension remains behind on the filter paper. So, the method of filtration can be used to separate the components of a solid-liquid suspension.
Question 7
1 / -0

Which of the following is a characteristic feature of a pure substance?

A
Substances with uniform composition throughout

B
Substances that always have the same colour throughout

C
Substance that always have the same taste throughout

D
All of the above

Solution

A pure substance is one which has a uniform composition throughout. Also, all the different parts of it would have the same texture, smell and taste.
So, option D is correct.
Question 8
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A process that separates a pure solid in the form of its crystals from a solution is known as :

A
centrifugation

B
crystallization

C
distillation

D
none of the above

Solution

Crystallization is a process that separates a pure solid in the form of crystal from its solution. It is a techniques to purify solids.
Question 9
1 / -0

In the process of crystallisation, crystals formed by different substances :

A
are of same shapes and colours

B
are of different shapes and colours

C
shape and colour depends upon the amount of solute present

D
can't be predicted

Solution

Different substances form crystals of different shapes and colours.
Question 10
1 / -0

Sulphur powder and iron filings is an example of:

A
homogenous mixture

B
heterogeneous mixture

C
compounds

D
All of the above

Solution

Mixture with different compositions and different properties at different locations in the mixture is called heterogeneous mixture.

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Is Matter Around Us Pure Test - 42

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Is Matter Around Us Pure Test - 42

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Question 1

homogeneous mixture

heterogeneous mixture

supersaturated solution

none of the above

Solution

Question 2

I, II

II, III

I, III

I, II, III

Solution

Question 3

solid/liquid, gas/solid

gas, liquid

solid, liquid/gas

solid/liquid/gas, liquid

Solution

Question 4

solid obtained after evaporation contains impurities

some solids decompose on heating

both A and B

none of the above

Solution

Question 5

sedimentation

crystallisation

filtration

decantation

Solution

Question 6

chromatography

filtration

handpicking

None of the above

Solution

Question 7

Substances with uniform composition throughout

Substances that always have the same colour throughout

Substance that always have the same taste throughout

All of the above

Solution

Question 8

centrifugation

crystallization

distillation

none of the above

Solution

Question 9

are of same shapes and colours

are of different shapes and colours

shape and colour depends upon the amount of solute present

can't be predicted

Solution

Question 10

homogenous mixture

heterogeneous mixture

compounds

All of the above

Solution

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