Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 64

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Weekly Quiz Competition

Question 1
1 / -0

When dispersed phase is liquid and dispersing medium is gas, the colloidal system is called:

A
smoke

B
emulsion

C
aerosol

D
gel

Solution

When the dispersed phase is solid or liquid and the dispersing medium is gas, the colloidal system is called aerosol.

Examples: Clouds, fog, insecticide spray, mist, etc.
Question 2
1 / -0

Suspensions are:

A
visible to naked eye

B
invisible through microscope

C
not visible by any means

D
invisible under electron microscope

Solution

Suspensions are heterogeneous mixtures in which particle size is more than the colloidal particle and large enough to be seen with naked eye.
Question 3
1 / -0

Curd belongs to which type of colloid?

A
Gel

B
Sol

C
Emulsion

D
Solid sol

Solution

Curd is an example of a gel type of colloid. In it, the dispersed phase is liquid and the dispersing medium is solid.
Question 4
1 / -0

Which is not lyophilic colloid?

A
Milk

B
Gum

C
Fog

D
Blood

Solution

Lyophilic colloids are the ones in which the dispersed particles have a strong affinity for the dispersed medium. Milk, gum, and blood are lyophilic colloids, but fog is not a lyophilic colloid. Fog is an aerosol type of colloid in which liquid is dispersed in gas. So C is the correct option.
Question 5
1 / -0

An aerosol is a fine dispersion of:

A
tiny air bubbles in liquid

B
tiny droplets of liquid in the air

C
tiny solid particles in liquid

D
none of the above

Solution

An aerosol is a suspension of fine solid particles or liquid droplets in air or any other gas.
Example: fog, dust, etc.
Question 6
1 / -0

All the substance which are made of the same kind of particles are called as ______.

A
pure substance

B
impure substance

C
mixture

D
none of these

Solution

All the substances which are made up of the same kind of particles are called pure substances.

Example: salt is pure substance as all the particles in salt are of the same type.

Hence, the correct option is $$\text{A}$$
Question 7
1 / -0

Clouds, mist, fog, and perfume sprays are colloidal solutions of a:

A
liquid in a gas

B
gas in a solid

C
solid in a gas

D
gas in a liquid

Solution

Clouds, mist, fog and perfume sprays are aerosols, which are a type of colloid. In them, liquid is the dispersed phase while gas is the dispersing medium.
Question 8
1 / -0

Consider the list of following substances. How many of the following are pure substances?

Oxygen, fluorine, paints, hydrochloric acid, methane

A
1

B
2

C
3

D
4

Solution

Pure substances contain particles of similar type. Generally, elements and compounds are the pure substances. Thus oxygen, fluorine, hydrochloric acid, and methane are pure substances. Paint is not a pure substance as it is a mixture of different particles.
Question 9
1 / -0

Which method can be applied to separate a mixture of camphor and benzoic acid?

A
Sublimation

B
Chemical Methods

C
Crystallisation

D
Extraction with solvent

Solution

As by the process of sublimation, both will get sublime.
We can separate them by mixing them in hot water and then filtering the solution. Residue will be camphor and filtrate will be mixture of water & benzoic acid and we can get benzoic acid by crystallization method.
Question 10
1 / -0

Which of the following does not represent a characteristic of pure substance?

A
It has a uniform texture throughout (homogeneous).

B
It has a fixed boiling point or melting point.

C
It is made up of different types of particles.

D
It can be an element or a compound.

Solution

Pure substances have uniform composition, fixed melting, and boiling point. They can be an element or a compound. A pure substance is made up of only one type of particle.
Hence, option C is correct.

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Is Matter Around Us Pure Test - 64

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Is Matter Around Us Pure Test - 64

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Question 1

smoke

emulsion

aerosol

gel

Solution

Question 2

visible to naked eye

invisible through microscope

not visible by any means

invisible under electron microscope

Solution

Question 3

Gel

Sol

Emulsion

Solid sol

Solution

Question 4

Milk

Gum

Fog

Blood

Solution

Question 5

tiny air bubbles in liquid

tiny droplets of liquid in the air

tiny solid particles in liquid

none of the above

Solution

Question 6

pure substance

impure substance

mixture

none of these

Solution

Question 7

liquid in a gas

gas in a solid

solid in a gas

gas in a liquid

Solution

Question 8

1

2

3

4

Solution

Question 9

Sublimation

Chemical Methods

Crystallisation

Extraction with solvent

Solution

Question 10

It has a uniform texture throughout (homogeneous).

It has a fixed boiling point or melting point.

It is made up of different types of particles.

It can be an element or a compound.

Solution

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