Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 75

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Question 1
1 / -0

What is this activity?

A
Sublimation

B
Crystallisation

C
Evaporation

D
None of the above

Solution

This activity shows sublimation. Here, camphor sublimes, i.e. it changes into vapour upon heating.
Question 2
1 / -0

Arrange true solution, colloidal solution, and suspension in the decreasing order of their particle size.

A
Suspension > True solution > Colloid

B
Colloid > Suspension > True solution

C
Suspension > Colloid > True solution

D
True solution > Colloidal > Suspension
Solution
Particles of a true solution are smaller than 1 nm in diameter and cannot be seen by naked eyes.
Particles of a colloid are too small to be individually seen by naked eyes but larger than particles of true solutions.
Particles of a suspension can be seen by the naked eye. They are larger than those of colloids and true solutions.
Question 3
1 / -0

Gold sol is not

A
a macromolecular colloid

B
a lyophobic colloid

C
a multimolecular colloid

D
negatively charge colloid
Question 4
1 / -0

The experimental setup shows that the small beaker is filled with ice. At first, the large beaker is empty. Where did the water in the large beaker probably come from?

A
Water condensing on the small beaker's surface dripping down.

B
Melted ice dripping down through a crack in the small beaker.

C
A chemical reaction between the ice and the glass of the beaker.

D
Water condensing on the inside of the large beaker.

Solution
Question 5
1 / -0

How many of the following are elements:
Diamond, Graphite, Silica, Alumina, Sodium, and Water

A
5

B
3

C
7

D
8

Solution

Diamond and Graphite are made up of carbon atoms only. So, they are elements. Sodium(Na) made up of sodium atoms is also an element.
Silica ($$SiO_2$$), alumina ($$Al_2O_3$$) and water ($$H_2O$$) are compounds.
Therefore, there are three elements in the given list.
So, the correct option is B.
Question 6
1 / -0

Which characterstic is true in respect of colloidal particle?

A
They always have two phase

B
They are only in liquid state

C
They can't be electrolysed

D
They are only hydrophilic

Solution

Dispersion medium and dispersed phase are the two-phase of colloid. The substances which are dispersed in the solution are called the dispersed phase, and the solution in which it is dispersed is called dispersion medium.
Question 7
1 / -0

Which one of the following is not a colloidal solution?

A
Smoke

B
Ink

C
Air

D
Blood

Solution

Air is not a colloidal solution because it is a homogeneous mixture of different gases. Smoke, Ink, and blood are colloids. Hence option C is correct.
Question 8
1 / -0

A mixture of methanol (B.P 64.7$$^oC$$ ) and acetone (B.P 56$$^oC$$ ) can be separated by:

A
Simple distillation

B
Fractional distillation

C
Centrifugation

D
None of these

Solution

Simple distillation is employed for separating a mixture of two or more liquids having more than 25$$^oC$$ difference in their boiling point.
Centrifugation is used to separate solids from their heterogeneous mixtures in liquids based on the difference in their densities.

Fractional distillation is employed for a separating mixture of two or more liquids having boiling points less than 25 $$^oC$$. The boiling point of Methanol is 64.7$$^oC$$ and the boiling point of Acetone is 56$$^oC$$
Question 9
1 / -0

Which one of the following is not a colloid?

A
Milk

B
Blood

C
Solution of urea

D
Jelly

Solution

Solution of urea is not a colloid. It is a homogeneous solution of urea particles in water. The other three options (milk, blood and jelly) are colloids. They are heterogeneous mixtures in which there is a dispersed phase and a dispersing medium.
Question 10
1 / -0

Which of the following is property of colloid?

A
scattering of light

B
They show attraction

C
sublimation

D
opaque

Solution

Scattering of light is a property of colloid. Tyndall effect is the best example of the property of colloid.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 75

Result

Is Matter Around Us Pure Test - 75

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SHARING IS CARING

Question 1

Sublimation

Crystallisation

Evaporation

None of the above

Solution

Question 2

Suspension > True solution > Colloid

Colloid > Suspension > True solution

Suspension > Colloid > True solution

True solution > Colloidal > Suspension

Solution

Question 3

a macromolecular colloid

a lyophobic colloid

a multimolecular colloid

negatively charge colloid

Question 4

Water condensing on the small beaker's surface dripping down.

Melted ice dripping down through a crack in the small beaker.

A chemical reaction between the ice and the glass of the beaker.

Water condensing on the inside of the large beaker.

Solution

Question 5

5

3

7

8

Solution

Question 6

They always have two phase

They are only in liquid state

They can't be electrolysed

They are only hydrophilic

Solution

Question 7

Smoke

Ink

Air

Blood

Solution

Question 8

Simple distillation

Fractional distillation

Centrifugation

None of these

Solution

Question 9

Milk

Blood

Solution of urea

Jelly

Solution

Question 10

scattering of light

They show attraction

sublimation

opaque

Solution

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