Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Crude oil is purified using fractional distillation process. This method works on the principle of:

A
differences in the masses of the components

B
differences in the volumes of the components

C
differences in the boiling points of the components

D
their solubility in water

Solution

The different hydrocarbon components of crude oil are called fractions. The fractions are separated from one another using a process called fractional distillation. This process is based on the principle that different substances boil at different temperatures. So options A, B, and D are incorrect and, option C is correct.
Question 2
1 / -0

Evaporation followed by condensation occurs in:

A
filtration

B
sublimation

C
evaporation

D
distillation

Solution

Distillation is the process of separating the components substances from a liquid mixture by using selective evaporation and condensation.
Water is sprinkled before dusty room as it helps dust to settle down. The lighter dust particles on becoming wet with water become heavier and can be easily renowned here water coagulates the dust particles.
Question 3
1 / -0

Which of the following statements is not true about suspension ?

A
The particles of suspension can be separated from solvent by the process of filtration

B
When the suspension is kept undisturbed then the particles of suspension settle down

C
A suspension is homogeneous in nature

D
Scattering of particles take place in suspension

Solution

Suspension is heterogenous in nature, i.e. two phases which are not miscible, e.g., clay particles dissolve in water fand orm a suspension with it.
Question 4
1 / -0

Which one of the following is not a property of solution?

A
Solution is a homogeneous mixture

B
Solution does not scatter light

C
Path of light is visible in solution

D
Solute particles do not settle down when left undisturbed

Solution

A solution is a special type of homogeneous mixture. Solutions are homogeneous because the ratio of solute to solvent remains the same throughout the solution even if homogenized with multiple sources, and stable because the solute will not settle out after any period of time, and it cannot be removed by a filter or a centrifuge. This type of mixture is very stable, i.e., its particles do not settle, or separate.

As a homogeneous mixture, a solution has one phase (liquid) although the solute and solvent can vary: for example, salt water. In chemistry, a mixture is a substance containing two or more elements or compounds that are not covalently bound to each other and which retain their own chemical and physical identities; a substance which has two or more constituent physical substances.
This doesn't scatter light the path of light is visible in solution.
Question 5
1 / -0

Raghav, Ajay and Nita were given three test tubes K, L and M respectively containing unknown substances They observed the following properties about their solutions
Substance Property
K The components can be separated by filtration
L Particles scatter the light
M Particles size is $$\displaystyle 10^{-9}$$ to $$\displaystyle 10^{-7}$$ m
On the basis of the above properties identify the solutions K, L and M respectively

A
Ferrous sulphate solution, tonic, paints

B
Calcium carbonate solution, paints, milk

C
Muddy water, milk, calcium carbonate solution

D
Paints, ferrous sulphate solution, calcium carbonate solution

Solution

Muddy water is a suspension solution and suspension solution can be filtered by filtration.
Colloidal solution shows tyndall effect so milk can scatter the light.
Calcium carbonate solution partice size is approx $$10^{-9}m$$ to $$10^{-7} m$$.
Question 6
1 / -0

Which of the following involves fractional distillation?
i. Separation of constituents from liquefied air
ii. Separation of constituents from crude petroleum
iii. Separation of carbon tetrachloride from water
iv. Separation of naphthalene from common salt.

A
i and ii

B
i and iv

C
ii and iv

D
i and iii

Solution

The fractional distillation method is used to separate components with a very small difference in their boiling point.
Liquefied air and crude petroleum products have a very small difference in their boiling point and can be separated by the fractional distillation method.

Carbon tetrachloride is immiscible with water and forms a separating layer when mixed together. Hence, can be separated by using a separating funnel.

Naphthalene and common salt can be separated by using sublimation. Sublimation involves conversion from solid to gas phase so naphthalene vapors can be collected after sublimation and common salt remains at the bottom.

Hence, option $$A$$ is correct.
Question 7
1 / -0

Which of the following best describes the methods to separate a mixture of two miscible liquids and two immiscible liquids respectively?

A
Separating funnel and fractional distillation

B
Fractional distillation and separating funnel

C
Fractional distillation and chromatography

D
None of these

Solution

Miscible liquids can be separated using fractional distillation. By this technique, components of the mixture can be separated based on the difference in boiling points.
Separating funnel helps in separating two immiscible liquids. In this, two layers are seen. The denser liquid will be the bottom layer and the lighter liquid will be top layer.
On the other hand, chromatography is used in the separation of homogeneous mixtures, therefore, can not be used to separate immiscible liquid mixtures.
Hence, option B is correct.
Question 8
1 / -0

A mixture of sodium chloride and calcium carbonate is separated using the steps given. In which order should the steps be carried out?

A
1, 2 then 3

B
2, 1 then 3

C
1, 3 then 2

D
3, 1 then 2

Solution

First, we dissolve mixture, only $$NaCl$$ will dissolve and calcium carbonate forms precipitate.
Now, we filter this solution and calcium carbonate separates.
Then we use evaporation to separate $$NaCl$$ from the solution.
Question 9
1 / -0

Does Nandita have a liquid $$Y$$ which boils at 388 K. Which of the following separation method will Nandita adopt to separate $$Y$$ from a mixture containing another substance $$Z$$ which boils at 368 K?
(Both $$Y$$ and $$Z$$ are miscible)

A

B

C

D

Solution

Fractional distillation is a process used to separated miscible liquids with small differences in boiling points (less than $$25^{o}C$$). As the difference in boiling points between $$Y, Z$$ is $$388-368=20k$$, fractional distillation can be used to separated Y and Z liquids.
Option B represents simple distillation while option C represents fractional distillation.
Hence, option $$C$$ is correct.
Question 10
1 / -0

In which of the following, dispersed phase is a liquid while dispersion medium is a gas?

A
Cloud

B
Smoke

C
Gel

D
Soap bubble

Solution

A dispersion is a system in which particles are in a continuous phase of a different composition or state. Colloid can be made from almost any combination of gas, liquid and solid. The particles which the colloid is made up of are called dispersed material. A liquid dispersed in a gas is referred to as fog or cloud.

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Substance	Property
K	The components can be separated by filtration
L	Particles scatter the light
M	Particles size is $$\displaystyle 10^{-9}$$ to $$\displaystyle 10^{-7}$$ m

Is Matter Around Us Pure Test - 34

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Is Matter Around Us Pure Test - 34

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Question 1

differences in the masses of the components

differences in the volumes of the components

differences in the boiling points of the components

their solubility in water

Solution

Question 2

filtration

sublimation

evaporation

distillation

Solution

Question 3

The particles of suspension can be separated from solvent by the process of filtration

When the suspension is kept undisturbed then the particles of suspension settle down

A suspension is homogeneous in nature

Scattering of particles take place in suspension

Solution

Question 4

Solution is a homogeneous mixture

Solution does not scatter light

Path of light is visible in solution

Solute particles do not settle down when left undisturbed

Solution

Question 5

Ferrous sulphate solution, tonic, paints

Calcium carbonate solution, paints, milk

Muddy water, milk, calcium carbonate solution

Paints, ferrous sulphate solution, calcium carbonate solution

Solution

Question 6

i and ii

i and iv

ii and iv

i and iii

Solution

Question 7

Separating funnel and fractional distillation

Fractional distillation and separating funnel

Fractional distillation and chromatography

None of these

Solution

Question 8

1, 2 then 3

2, 1 then 3

1, 3 then 2

3, 1 then 2

Solution

Question 9

Solution

Question 10

Cloud

Smoke

Gel

Soap bubble

Solution

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