Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Water, ice, and steam are all:

A
elements

B
mixtures

C
compounds

D
none of these

Solution

Water, ice, and steam all have the same molecular formula $$H_2O$$. So, they are compounds.
Question 2
1 / -0

Oil and water can be seperated by:

A
separating funnel

B
sedimentation

C
centrifugation

D
None of the above

Solution

Oil and water are two immiscible liquids and their separation is based on differences in densities of these liquids. A separating funnel is used for this purpose.
Question 3
1 / -0

Which of the following method is used for the separation of different components of petroleum?

A
Fractional distillation

B
Sublimation

C
Chromatography

D
Simple distillation

Solution

Fractional distillation is the separation of a mixture into its component parts or fractions such as in separating chemical compounds by their boiling point by heating them to a temperature at which one or more fractions of compound will vaporize.
Question 4
1 / -0

We can get a pure liquid from a solution by:

A
evaporation

B
crystallisation

C
filtration

D
distillation

Solution

We can get pure liquid from a solution by distillation. Distillation separates the components or substance from a liquid mixture by selective evaporation and condensation.
Question 5
1 / -0

Liquids which do not dissolve in each other are called:

A
miscible liquids

B
immiscible liquids

C
dissociated liqids

D
None of the above

Solution

Liquids which do not dissolve in each other are called immiscible liquids. Immiscible liquids can be separated from each other by using a separating funnel.
Question 6
1 / -0

Two liquids having different boiling points can be separated by :

A
distillation

B
separating funnel

C
centrifugation

D
crystallization

Solution

Distillation is a method for separating a liquid from a mixture of two or more liquids. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.
Question 7
1 / -0

Pure substances consists of :

A
one type of particles

B
more than one type of particles

C
many types of particles but their chemical properties should be same

D
All of the above

Solution

Pure substances are substances whose all constituent particles are same in their chemical nature. Pure substance means a single substance, its composition is uniform throughout.
Question 8
1 / -0

We sprinkle water in a dirty room before sweeping because:

A
water makes sweeping easier

B
water repels dust particles

C
water coagulates the dust particles

D
sprinkling water is fashionable

Solution

Water is sprinkled before sweeping a dusty room as it helps dust to settle down. The lighter dust particles on becoming wet with water become heavier and can be easily removed. It also prevents dust to fly up again in the room.
Hence, option C is correct.
Question 9
1 / -0

Zig-zag motion of the solute particle in a solution is known as :

A
linear motion

B
brownian motion

C
circular motion

D
curved motion

Solution

This is the random motion of particles suspended in a fluid resulting from their collision with the quick atoms or molecules in the gas or liquid. It is named after Robert Brown in 1827.
Question 10
1 / -0

Pure substances means:

A
all its constituent particles have same physical property

B
all its constituent particles have same chemical property

C
both A and B

D
none of these

Solution

Pure substances are substances whose all constituent particles are the same in their chemical properties. Pure substance means it is a single substance, its composition is uniform.
Example- Water

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 20

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Is Matter Around Us Pure Test - 20

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Question 1

elements

mixtures

compounds

none of these

Solution

Question 2

separating funnel

sedimentation

centrifugation

None of the above

Solution

Question 3

Fractional distillation

Sublimation

Chromatography

Simple distillation

Solution

Question 4

evaporation

crystallisation

filtration

distillation

Solution

Question 5

miscible liquids

immiscible liquids

dissociated liqids

None of the above

Solution

Question 6

distillation

separating funnel

centrifugation

crystallization

Solution

Question 7

one type of particles

more than one type of particles

many types of particles but their chemical properties should be same

All of the above

Solution

Question 8

water makes sweeping easier

water repels dust particles

water coagulates the dust particles

sprinkling water is fashionable

Solution

Question 9

linear motion

brownian motion

circular motion

curved motion

Solution

Question 10

all its constituent particles have same physical property

all its constituent particles have same chemical property

both A and B

none of these

Solution

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