Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

Which among the following can be given as an example of a homogenous mixture?

A
tap water

B
distilled water

C
sand and water

D
water and oil
Solution
Distilled water is a compound, not a mixture, since it is exactly pure $$H_2O$$
Sand and water and water in oil, are examples of heterogeneous mixtures.
Tap water contains some minerals as well as metallic impurities distributed uniformly throughout the sample.
Hence option $$(A)$$ is correct.
Question 2
1 / -0

Fractional distillation is used to separate liquids having an appreciable difference in their

A
size and shape

B
solubility

C
boiling points

D
None of these

Solution

Fractional distillation is the separation of a mixture into its component parts or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. It is used to separate liquids having an appreciable difference in their $$\text{boiling points}$$.
Question 3
1 / -0

Fractional distillation is used to separate liquids having an appreciable difference in their ______.

A
size and shape

B
solubility

C
boiling points

D
none of these

Solution

Fractional distillation is a technique used to separate two miscible liquids having a difference of $$25^oC$$ in their boiling points.
Option C is correct.
Question 4
1 / -0

Which of the following property is not shown by compounds?

A
They are heterogeneous.

B
They are homogeneous.

C
They have definite molecular formulae.

D
They have fixed melting and boiling points.

Solution

Mixtures are heterogeneous in nature but compounds are homogeneous in nature.
Option A is correct.
Question 5
1 / -0

Matter that contains two or more constituent substances, combined in definite proportion is called______

A
mixture

B
compound

C
element

D
metalloid

Solution

Elements are pure substances that contain only one type of atom. An element that has some properties of metals and some properties of non-metals is a metalloid. A matter that contains two or more constituents in random proportion is a mixture. A matter that contains two or more constituent substances, combined in definite proportion is called a compound. Based on the definitions, the correct option is B.
Question 6
1 / -0

Milk is an example of ______

A
solution

B
homogeneous mixture

C
heterogeneous mixture

D
suspension

Solution

Milk is a heterogeneous mixture of tiny globules of fat and protein dispersed in water.
Hence, option $$\text{C}$$ is the correct answer.
Question 7
1 / -0

Which is distilled first?

A
Liquid $$H_{2}$$

B
Liquid $$CO_{2}$$

C
Liquid $$O_{2}$$

D
Liquid $$N_{2}$$

Solution

Since liquid hydrogen has least molecular mass among given substances, therefore it has weakest intermolecular interaction. Thus it has minimum boiling point and is distilled first.
Hence, the correct option is $$A$$.
Question 8
1 / -0

Which of the following is not a substance?

A
Water

B
Smoke

C
Vision

D
Dust

Solution

Vision is not any substance, it is ability to see.
Question 9
1 / -0

A mixture consists of a soluble solid in a liquid. which method is most suitable for separating both the components?

A
Sedimentation

B
Winnowing

C
Distillation

D
Handpicking

Solution

Simple distillation can be used to separate liquid-like pure water from a solution of soluble solid like salt. During distillation, water is evaporated by heating. The evaporated water vapours are condensed and collected in the receiving flask. Soluble solid remains in the distillation flask.

Sedimentation is used to separate insoluble solid particles from a liquid.
Winnowing and handpicking cannot be employed to separate soluble solid particles from the liquid as the size of solute particles is not large enough.

Hence, Option C is correct.
Question 10
1 / -0

Which among the following is a homogeneous system but is not a compound?

A
Common salt

B
Oil

C
Milk

D
Salt in water

Solution

If it is not a chemical compound and then a homogeneous system must be a $$ solution $$.
Common salt is a chemical compound.
Oil is also a compound.
Milk is a colloidal solution, a Heterogeneous mixture.
Salt in water is a true solution, which means it's a homogenous system but not a compound as it's a mixture.
Option $$D$$

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Is Matter Around Us Pure Test - 70

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Is Matter Around Us Pure Test - 70

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Question 1

tap water

distilled water

sand and water

water and oil

Solution

Question 2

size and shape

solubility

boiling points

None of these

Solution

Question 3

size and shape

solubility

boiling points

none of these

Solution

Question 4

They are heterogeneous.

They are homogeneous.

They have definite molecular formulae.

They have fixed melting and boiling points.

Solution

Question 5

mixture

compound

element

metalloid

Solution

Question 6

solution

homogeneous mixture

heterogeneous mixture

suspension

Solution

Question 7

Liquid $$H_{2}$$

Liquid $$CO_{2}$$

Liquid $$O_{2}$$

Liquid $$N_{2}$$

Solution

Question 8

Water

Smoke

Vision

Dust

Solution

Question 9

Sedimentation

Winnowing

Distillation

Handpicking

Solution

Question 10

Common salt

Oil

Milk

Salt in water

Solution

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