Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 53

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Question 1
1 / -0

Crystallization is used to separate :

A
solid from solid

B
liquid from solid

C
solid from liquid

D
all of above

Solution

Crystallisation is a sophisticated form of the evaporation technique in which the formation of crystals of solute is encouraged during the process of its separation from the solution as the solvent evaporates.
Question 2
1 / -0

Which of the following method depends upon difference in boiling point?

A
Magnetic separation

B
Centrifugation

C
Chromatography

D
Distillation

Solution

Distillation is a process that can be used to separate a pure liquid from a mixture of liquids. It works when the liquids have different boiling points.

Option $$D$$ is correct.
Question 3
1 / -0

Purity of water can be checked by :

A
Distillation

B
Separating funnel

C
Centrifugation

D
None of above

Solution

Simple distillation is a method for separating the solvent from a solution. Every pure substance has its own particular melting point and boiling point. One way to check the purity of the separated liquid is to measure its boiling point. For example, pure water boils at $$100^0C$$. If it contains any dissolved solids, its boiling point will be higher than this.
Question 4
1 / -0

Which of the following statement is false regarding mixtures?

A
Salads are heterogeneous mixtures

B
$$NaCl(aq)$$ is a homogeneous mixture

C
Milk is a homogeneous mixture

D
Sand and water make a heterogeneous mixture

E
Pure iron is a heterogeneous mixture

Solution

A homogeneous mixture has the same uniform appearance and composition throughout.

A heterogeneous mixture consists of visibly different substances or phases. A salad with lettuce, cheese, seeds, tomatoes, broccoli, and other vegetables is an example of a heterogeneous mixture.

$$NaCl(aq)$$ solution and milk is a homogeneous mixture that has a uniform composition throughout.

Sand and water make a heterogeneous mixture as sand is insoluble in water and the mixture has localized regions with different properties.

Pure iron is not at all a mixture. It is a pure form of an element and can not be classified as a homogeneous or heterogeneous mixture.

Hence, option $$E$$ represents a false statement regarding mixtures.
Question 5
1 / -0

During the process of distillation, in which of the following lab equipment does the evaporation of the mixture takes place according to the setup shown in the figure?

A
Around the thermometer

B
In the circulating water

C
In the heated flask

D
In the condenser

E
In the distillate

Solution

According to the given laboratory setup for distillation, vaporisation takes place in the heated flask. The vapours then pass through the side tube into the condenser. In the condenser, the vapour gets condensed into a liquid, which is collected in the receiver as distillate.
Question 6
1 / -0

X and Y are liquids with unequal densities. Which method can be employed to separate them?

A
Handpicking

B
Chromatography

C
Distillation

D
Separating funnel

Solution

Separating funnel is an effective apparatus used to separate immiscible liquids by taking advantage of their unequal density. When the mixture of two immiscible liquids is allowed to stand, two separate layers are formed in the funnel, with the less dense layer on the top.
Question 7
1 / -0

Fractional distillation involves :

A
condensation

B
evaporation

C
both a and b

D
none of above

Solution

When vapours of a homegenous mixture are passed through the fractionating column, because of the repeated condensation and evaporation, the vapours of the liquid with the lower boiling point first pass out of the fractionating column. They are condensed and then collected in the receiver flask. The other liquid, with a slightly higher boiling point, can be collected similarly in another receiver flask.

Hence, option $$C$$ is correct.
Question 8
1 / -0

Apparatus used to separate particles in a colloid is:

A
centrifuge

B
barometer

C
balance

D
calorimeter

E
battery
Solution
- Apparatus used to separate particles in a colloid is centrifuge. That's because the particles cannot be separated by filtration or sedimentation.
- Calorimeter is used to measure the heat absorbed or released by a reaction.
- Barometer is used to measure pressure.
- Balance is used to measure weight of a substance.
- Battery is used to provide power backup.
Question 9
1 / -0

Solution of magnesium chloride dissolved in water is being distilled in the figure. On completion of distillation, where would magnesium chloride likely be found?

A
In the distillate

B
In the flask

C
In the circulating water

D
In the condenser

E
Nowhere as mentioned above

Solution

Magnesium chloride after completion of distillation will be found in the heated flask.
The flask initially contains a mixture of magnesium chloride and water. During distillation, water gets vapourised, leaving behind magnesium chloride.
Hence, the correct option is B.
Question 10
1 / -0

What information you can get by solubility of a solute?

A
The quantity of solvent

B
The quantity of solute

C
The temperature of the solution

D
All of the above

Solution

The solubility of a solute gives the following information:

(A) The quantity of solvent
(B) The quantity of solute
(C) The temperature of the solution

The solubility of a solute can be expressed as the quantity of solute (in grams or moles) present in a given quantity of solvent (volume in L) at a given temperature.

We can also say that the amount of the solute present in the saturated solution at a particular temperature is called its solubility. So, we get information about amount of solute/solvent and temperature from the solubility.

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Is Matter Around Us Pure Test - 53

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Is Matter Around Us Pure Test - 53

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SHARING IS CARING

Question 1

solid from solid

liquid from solid

solid from liquid

all of above

Solution

Question 2

Magnetic separation

Centrifugation

Chromatography

Distillation

Solution

Question 3

Distillation

Separating funnel

Centrifugation

None of above

Solution

Question 4

Salads are heterogeneous mixtures

$$NaCl(aq)$$ is a homogeneous mixture

Milk is a homogeneous mixture

Sand and water make a heterogeneous mixture

Pure iron is a heterogeneous mixture

Solution

Question 5

Around the thermometer

In the circulating water

In the heated flask

In the condenser

In the distillate

Solution

Question 6

Handpicking

Chromatography

Distillation

Separating funnel

Solution

Question 7

condensation

evaporation

both a and b

none of above

Solution

Question 8

centrifuge

barometer

balance

calorimeter

battery

Solution

Question 9

In the distillate

In the flask

In the circulating water

In the condenser

Nowhere as mentioned above

Solution

Question 10

The quantity of solvent

The quantity of solute

The temperature of the solution

All of the above

Solution

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