Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 63

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Question 1
1 / -0

Crystals can be grown by:

A
cooling a saturated solution

B
heating a saturated solution

C
stirring a saturated solution

D
planting in a well watered fertile soil

Solution

Heating is stopped at the point when a hot saturated solution is formed. If the resulting solution is allowed to cool to room temperature, the dissolved solid will precipitate out as pure crystals.
Hence, option A is correct.
Question 2
1 / -0

A student accidentally poured a blue liquid into a beaker of water in the laboratory. The blue liquid is immiscible in water and is denser than water. What must he use to separate the 2 liquids?

A
Filter Funnel

B
Displacement Can

C
Separating Funnel

D
Distilling Flask

Solution

In separating funnel, two liquids are separated depending upon their relative density. The liquid which is denser settles down below which can be separated and the liquid having lower density settled above.
Question 3
1 / -0

If two liquids are mutually soluble, they are called ________ liquids.

A
miscible

B
immiscible

C
permeable

D
impermeable

Solution

Two liquids dissolving completely in each other form a homogeneous mixture. Such liquids are called miscible liquids.
Question 4
1 / -0

The particles in various forms are visible only under an ultramicroscope. A solution containing such particles is called:

A
true solution

B
colloidal solution

C
saturated solution

D
heterogeneous solution

Solution

The particle size of a true solution is less than $$1nm$$ in diameter. Neither visible by naked eyes nor by microscope.
The particle size of the colloidal solution is between $$1nm\ to \ 1000nm$$. Not visible by naked eyes but visible by electron or ultramicroscope.
A saturated solution is a type in which no more solute can be dissolved in the solvent.
The homogeneous solution has one phase whereas the heterogeneous solution has more than one phase. It may be a true or colloidal solution.
Question 5
1 / -0

A solution is defined as a:

A
Homogeneous mixture of two or more substances

B
Heterogeneous mixture of two or more substances

C
Homogeneous mixture of liquid and solid components only

D
Homogeneous mixture consisting of water as one of the components

Solution

A solution is a homogeneous mixture of two or more substances. It may exist in any phase. It consists of a solute and a solvent.
The solute is the substance that is dissolved in the solvent.

For example, in a saline solution, salt is the solute dissolved in water as the solvent.
Question 6
1 / -0

Separation of oil from water is an example of ________.

A
decantation

B
sublimation

C
filtration

D
none of these

Solution

Oil and water are two immiscible liquids. They can't be filtered out. Neither of them can sublime. Since, they form two separate layers, we can separate them by decantation.
Hence, option A is correct.
Question 7
1 / -0

A pure substance can only be:

A
a compound

B
an element

C
a mixture

D
A or B

Solution

A pure substance is a substance in which only one type of atom or molecule is present. For example, water, sulphur, sucrose(pure), helium etc.
Hence, a pure substance can only be an element or a compound.
Hence, the answer is option $$D$$.
Question 8
1 / -0

Match the List-I (Colloidal dispersion) with List-II (Nature of the dispersion) and select the correct answer using the codes given below the lists:
Lits-I
(Cooloidal dispersion) List-II
(Nature of dispersion)
A. Milk 1. Solid in liquid
B.Clouds 2. Liquid in gas
C. Paints 3. Solid in solid
D. Jellies 4. Liquid in liquid
5. Liquid in solid

A
A- 4; B- 2; C- 1; D- 5

B
A- 1; B- 5; C- 3; D- 2

C
A- 4; B- 5; C- 1; D- 2

D
A- 1; B- 2; C- 3; D- 5

Solution

Milk is an emulsion of dispersed phase as a liquid in the dispersion medium as a liquid. This makes A-4, excludes Option B and D from answer choice.
Cloud is aerosol where dispersed phase is liquid and the dispersion medium is gas, Thus this makes B-2.
Paint is a solid phase in liquid medium makes C-1 and Jellies are a liquid phase in solid medium makes D-5.
Thus, option A is correct.
Question 9
1 / -0

Milk is an example of a colloid in which:

A
fat is dispersed in water

B
water is dispersed in fat

C
water is dispersed in oil

D
fat is dispersed in fat

Solution

Milk is an example of colloidal solution in which dispersed phase is fat and dispersion medium is water.
Question 10
1 / -0

Which of the following solution pairs can be separated by fractional distillation?

A
$$C_2H_5OH$$-water (Boiling point of ethanol = 351.45 K; boiling point of water = 373.2 K)

B
Water-$$HCl$$ (Boiling point of water = 373.2 K; boiling point of hydrochloric acid = 188.1 K)

C

Benzene-toluene (Boiling point of benzene= 353.2 K; boiling point of toluene = 383.8 K)

D
All of these

Solution

Fractional distillation is used for separating liquids that have difference in boiling points less than 25 K. Only for the liquid pairs in the first option, the boiling points differ by less than 25 K.

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Re-Attempt Weekly Quiz Competition

Lits-I (Cooloidal dispersion)	List-II (Nature of dispersion)
A. Milk	1. Solid in liquid
B.Clouds	2. Liquid in gas
C. Paints	3. Solid in solid
D. Jellies	4. Liquid in liquid
	5. Liquid in solid

Is Matter Around Us Pure Test - 63

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Is Matter Around Us Pure Test - 63

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Question 1

cooling a saturated solution

heating a saturated solution

stirring a saturated solution

planting in a well watered fertile soil

Solution

Question 2

Filter Funnel

Displacement Can

Separating Funnel

Distilling Flask

Solution

Question 3

miscible

immiscible

permeable

impermeable

Solution

Question 4

true solution

colloidal solution

saturated solution

heterogeneous solution

Solution

Question 5

Homogeneous mixture of two or more substances

Heterogeneous mixture of two or more substances

Homogeneous mixture of liquid and solid components only

Homogeneous mixture consisting of water as one of the components

Solution

Question 6

decantation

sublimation

filtration

none of these

Solution

Question 7

a compound

an element

a mixture

A or B

Solution

Question 8

A- 4; B- 2; C- 1; D- 5

A- 1; B- 5; C- 3; D- 2

A- 4; B- 5; C- 1; D- 2

A- 1; B- 2; C- 3; D- 5

Solution

Question 9

fat is dispersed in water

water is dispersed in fat

water is dispersed in oil

fat is dispersed in fat

Solution

Question 10

$$C_2H_5OH$$-water (Boiling point of ethanol = 351.45 K; boiling point of water = 373.2 K)

Water-$$HCl$$ (Boiling point of water = 373.2 K; boiling point of hydrochloric acid = 188.1 K)

Benzene-toluene (Boiling point of benzene= 353.2 K; boiling point of toluene = 383.8 K)

All of these

Solution

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