Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is seperation technique to seperate kerosene oil, water and salt?

A
Funnel Separation

B
Evaporation

C
Distillation

D
All of these

Solution

As common salt and water are miscible while sand is immiscible in solution so first separating funnel to separate kerosene oil followed by evaporation and distillation.
Question 2
1 / -0

What would you observe when a mixture of iron filings and sulphur powder is heated strongly?

A
No change at all.

B

The mixture will change its state.

C
No change in the chemical composition of the mixture.

D

A new compound known as ferrous sulphide will be formed.

Solution

When sufficiently heated, iron filings and sulfur react to produce a compound, iron (II) sulfide which is black in colour.
$$Fe+S \rightarrow FeS$$
Question 3
1 / -0

You are provided with a mixture of petroleum and water. You can separate this mixture by_____.

A
distillation

B
oxidation

C
reduction

D
dehydration

Solution

Mixtures of petroleum and water can be separated by the process of distillation. Petroleum is lighter than water, it floats on water and forms the upper layer.
Hence, option A is correct.
Question 4
1 / -0

When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk. This indicates that milk is :

A
pure

B
colloidal

C
particle

D
none of the above

Solution

The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. The amount of scattering depends on the frequency of the light and density of the particles.
Milk is a colloid that exhibits the Tyndall effect.
Question 5
1 / -0

Filtration as a method of separation can be used for mixtures that are:

A
Homogeneous and liquid-in-gas mixtures.

B
Heterogeneous and liquid-in-gas mixtures.

C
Homogeneous and solid-in-liquid mixtures.

D
Heterogeneous and solid-in-liquid mixtures.

Solution

Filtration is a separation method. This is a more common method of separating an insoluble solid from a liquid. An example of such a mixture is sand and water.
Hence, option (D) is the correct answer.
Question 6
1 / -0

Which one of the following statements is incorrect?

A
All elements are homogeneous

B
Compounds made up of a number of elements are homogeneous

C
A mixture is not always heterogeneous

D
Air is a heterogeneous mixture

Solution

All elements and compounds are homogeneous, as they are pure substances. A mixture can be homogeneous or heterogeneous. So, options A, B and C are correct statements.

Air is a homogeneous mixture as the components are spread uniformly throughout the mixture. So, option D is an incorrect statement.

Thus, option D is correct answer.
Question 7
1 / -0

The substance which gives colloidal solution in water is :

A
sugar

B
soap

C
alum

D
plaster of paris

Solution

A colloidal solution is a solution in which a material is evenly suspended in a liquid. Classification of colloids depends on the dispersed phase and the dispersion medium. The various types are sol, emulsion, foam and aerosol. Soap is a type of foam in which the dispersion medium is a liquid and the dispersed phase is a gas.
Question 8
1 / -0

Arun has prepared 0.01 % (by mass) solution of sodium chloride in water.
Which of the following correctly represents the composition of the solutions?

A
1.00 g of NaCl + 100g of water

B
0.11g of NaCl + 100g of water

C
0.0l g of NaCl + 99.99g of water

D
0.10 g of NaCl + 99.90g of water

Solution

Mass by mass % $$= \frac{Mass of solute}{Mass of solution}\times 100$$
$$=\frac{.01}{100} = 0.01$$%
$$=\frac{.01}{0.01+99.99}\times 100$$
$$=\frac{0.01}{100}\times 100$$
Hence, mass of solute $$= 0.01 $$ g and mass of solvent $$= 99.99 gms$$.
Question 9
1 / -0

Which of the following are homogeneous in nature?
(i) Ice (II) Wood (iii) Soil (iv) Air

A
(i) and (iii)

B
(ii) and (iv)

C
(i) and (iv)

D
(iii) and (iv)
Solution
Hint: homogenous mixtures have uniform composition throughout the mixtures.
Explanation:
- Ice is a solid form of water, which is consisting of water molecules. Its composition is uniform.
- Wood consists of plant substances like microfibrils of cellulose (40% to 50%) and hemicellulose (15% to 25%) impregnated with lignin (15% to 30%), dead cells, etc. So, Their composition is not uniform.
- The Soil consists of rock, sand, plant waste, etc. hence, it is also not a homogenous mixture.
- Air is a homogenous mixture of gases like nitrogen, oxygen, carbon dioxide, etc.
Hence, Air and Ice are homogenous in nature.

Correct Option: $$C$$
Question 10
1 / -0

A mixture of sand and iodine can be separated by:

A
distillation

B
magnetic separation

C
sublimation

D
filtration

Solution

Sublimation is one of the separation techniques to separate solid-solid mixture. As iodine sublime, ( it changes to gaseous state from solid state without changing in liquid state on heating) it can be separated from sand by sublimation.

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Is Matter Around Us Pure Test - 25

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Is Matter Around Us Pure Test - 25

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SHARING IS CARING

Question 1

Funnel Separation

Evaporation

Distillation

All of these

Solution

Question 2

No change at all.

The mixture will change its state.

No change in the chemical composition of the mixture.

A new compound known as ferrous sulphide will be formed.

Solution

Question 3

distillation

oxidation

reduction

dehydration

Solution

Question 4

pure

colloidal

particle

none of the above

Solution

Question 5

Homogeneous and liquid-in-gas mixtures.

Heterogeneous and liquid-in-gas mixtures.

Homogeneous and solid-in-liquid mixtures.

Heterogeneous and solid-in-liquid mixtures.

Solution

Question 6

All elements are homogeneous

Compounds made up of a number of elements are homogeneous

A mixture is not always heterogeneous

Air is a heterogeneous mixture

Solution

Question 7

sugar

soap

alum

plaster of paris

Solution

Question 8

1.00 g of NaCl + 100g of water

0.11g of NaCl + 100g of water

0.0l g of NaCl + 99.99g of water

0.10 g of NaCl + 99.90g of water

Solution

Question 9

(i) and (iii)

(ii) and (iv)

(i) and (iv)

(iii) and (iv)

Solution

Question 10

distillation

magnetic separation

sublimation

filtration

Solution

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