Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

Match the column-I with column-II and select the correct option from the codes given below:

Column-I Column-II
(a) Ammonium chloride and salt (i)
(b) Oil and water (ii)
(c) Drugs in blood (iii)
(d) Ethyl alcohol and water (iv)

A
(a - i), (b - iii), (c - ii), (d - iv)

B
(a - ii), (b - iv), (c - i), (d - iii)

C
(a - ii), (b - iii), (c - iv), (d - i)

D
(a - iii), (b - ii), (c - i), (d - iv)

Solution

Ammonium chloride is a sublimable compound, so sublimation is used to separate ammonium chloride and salt.

Oil and water are immiscible liquids, so they are separated using a separating funnel.

Drugs in blood are separated using chromatography.

Ethyl alcohol and water are separated using distillation.
Question 2
1 / -0

Which of the following process is used to obtain common salt from seawater?

A
Distillation

B
Evaporation

C
Filtration

D
Sublimation

Solution

Seawater is trapped in large, shallow pools and allowed to stand there. The sun’s heat evaporates the water slowly, and common salt is left behind. This salt is further collected, purified, and packed for domestic use. The concentrated brine precipitates the salt, which is then gathered by mechanical harvesting machines. Any impurities that may be present in the brine are drained off and discarded before harvesting.
Preparation of salt from seawater involves evaporation in which water undergoes evaporation leaving behind salt.
Option B is correct.
Question 3
1 / -0

$$X$$ and $$Y$$ are miscible liquids. The boiling point of $$X$$ is $$56^\circ\, C$$ and that of $$Y$$ is $$100^\circ\, C$$. Which separation technique can be used to separate $$X$$ and $$Y$$ from the mixture?

A
Separating funnel

B
Distillation

C
Centrifugation

D
Handpicking

Solution

Distillation is the process of separating the components of a liquid mixture by selective evaporation and condensation. It is used to separate homogeneous mixtures where the components have an appreciable difference in boiling points.
Separating funnel, centrifugation and handpicking are essentially used to separate the components of heterogeneous mixtures.

Hence, option $$B$$ is correct.
Question 4
1 / -0

Which is the most effective method of separating mixtures of miscible volatile liquids?

A
Fractional distilliation

B
Hand picking

C
Chromatography

D
Filtration

Solution

Fractional distillation is the most effective method of separating mixtures of miscible volatile liquids. It is used when the difference in the boiling points of liquids to be separated is less than $$20\ K $$.

Simple distillation is used to purify liquid containing non-volatile impurities. It is used when the difference in the boiling points of liquids to be separated is between $$30\ K$$ to $$ 50\ K$$. It is used for liquids that do not decompose on heating.

Chromatography is used to separate a mixture having a different affinity for stationary phase and mobile phase.

Filtration is used to separate a solid from a liquid.
Question 5
1 / -0

The principle source of oxygen in industry today is:

A
thermal dissociation of dinitrogen tetraoxide

B
electrolysis of nitric acid

C
reduction of nitrous oxide

D
fractional distillation of liquid air

Solution

The principle source of oxygen in industry today is fractional distillation of liquid air. In this commercial method, air is liquefied by using Joule-Thomson effect. Water vapour and carbon dioxide are removed by solidification. Liquid oxygen ( boiling point $$\displaystyle -183 \ ^oC$$) is separated from liquid nitrogen ( boiling point $$\displaystyle -195.8 \ ^oC$$) by fractional distillation.
Question 6
1 / -0

Oxygen is manufactured by the fractional evaporation of :

A
water

B
liquid air

C
hydrogen peroxide

D
liquid oxygen

Solution

Oxygen is manufactured by the fractional evaporation of liquid air. In this commercial method, the air is liquefied by using the Joule-Thomson effect. Water vapor and carbon dioxide are removed by solidification. Liquid oxygen (boiling point $$\displaystyle -183 \ ^oC$$) is separated from liquid nitrogen (boiling point $$\displaystyle -195.8 \ ^oC$$) by fractional distillation.
Question 7
1 / -0

Which of the following is not a suspension?

A
Flour in water

B
Chalk in water

C
Muddy water

D
Milk

Solution

Milk is a colloid and is a mixture of fat dispersed and suspended in water. Suspension is distinguished from colloids by larger particle sizes which settle down when the solution is kept undisturbed, which is the case with the solutions mentioned in A, B and C.
Question 8
1 / -0

Identify A-F in the given flow chart.

A
A : Jelly

B : Shaving cream

C : Milk

D : Fog

E : Cheese

F : Gemstones

B
A : Milk of magnesia

B : Shaving cream

C : Mud

D : Cloud

E : Butter

F : Gemstones

C
A : Cloud

B : Shaving cream

C : Jelly

D : Fog

E : Rubber

F : Gemstones

D
A : Fog

B : Shaving cream

C : Milk

D : Mud

E : Jelly

F : Gemstones

Solution

Examples of different types of colloids are given below:

A. Aerosols: Fog, smoke, dust

B. Foam: Froath, whipped cream, shaving cream

C. Emulsion: Milk, hair cream

D. Sol: Paints, cell fluids, mud

E. Gel: Cheese, butter, jellies

F. Solid sol: Some coloured glasses, gemstones
Question 9
1 / -0

Which one of the following is not a colloid?

A
Milk

B
Blood

C
Ice cream

D
Honey

Solution

This question can be solved through the process of elimination,

Blood is a colloidal substance because there are macromolecules (antibodies, proteins) in the blood.
Milk is a colloidal solution of fat (globules).
Ice cream is a colloid, combining an emulsion and a foam, of milk fats.

As options A, B and C are colloids, the only option that is left that is not a colloid is D.
Question 10
1 / -0

A mixture of iodine and methyl alcohol can be separated by:

A
solvent extraction

B
distillation

C
sublimation

D
crystallisation

Solution

Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation.
Distillation may result in essentially complete separation or it may be a partial separation that increases the concentration of selected components of the mixture.
This process is based on the volatile nature of substance so when the mixture of iodine and methyl alcohol is heated, then methyl alcohol gets vaporised as it is more volatile than iodine.

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Re-Attempt Weekly Quiz Competition

Column-I	Column-II
(a) Ammonium chloride and salt	(i)
(b) Oil and water	(ii)
(c) Drugs in blood	(iii)
(d) Ethyl alcohol and water	(iv)

Is Matter Around Us Pure Test - 35

Result

Is Matter Around Us Pure Test - 35

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Question 1

(a - i), (b - iii), (c - ii), (d - iv)

(a - ii), (b - iv), (c - i), (d - iii)

(a - ii), (b - iii), (c - iv), (d - i)

(a - iii), (b - ii), (c - i), (d - iv)

Solution

Question 2

Distillation

Evaporation

Filtration

Sublimation

Solution

Question 3

Separating funnel

Distillation

Centrifugation

Handpicking

Solution

Question 4

Fractional distilliation

Hand picking

Chromatography

Filtration

Solution

Question 5

thermal dissociation of dinitrogen tetraoxide

electrolysis of nitric acid

reduction of nitrous oxide

fractional distillation of liquid air

Solution

Question 6

water

liquid air

hydrogen peroxide

liquid oxygen

Solution

Question 7

Flour in water

Chalk in water

Muddy water

Milk

Solution

Question 8

A : JellyB : Shaving creamC : Milk D : FogE : CheeseF : Gemstones

A : Milk of magnesiaB : Shaving creamC : MudD : CloudE : ButterF : Gemstones

A : CloudB : Shaving creamC : Jelly D : FogE : RubberF : Gemstones

A : FogB : Shaving creamC : Milk D : MudE : JellyF : Gemstones

Solution

Question 9

Milk

Blood

Ice cream

Honey

Solution

Question 10

solvent extraction

distillation

sublimation

crystallisation

Solution

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A : Jelly

B : Shaving cream

C : Milk

D : Fog

E : Cheese

F : Gemstones

A : Milk of magnesia

B : Shaving cream

C : Mud

D : Cloud

E : Butter

F : Gemstones

A : Cloud

B : Shaving cream

C : Jelly

D : Fog

E : Rubber

F : Gemstones

A : Fog

B : Shaving cream

C : Milk

D : Mud

E : Jelly

F : Gemstones