Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 48

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Weekly Quiz Competition

Question 1
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Which of the following is a property of compound?

A
A compound can be broken into its constituents.

B
A compound has a fixed composition.

C
A compound has a distinct set of properties that is not similar to the properties of its constituent elements.

D
All of the above

Solution

When two or more elements combine chemically by mass in a fixed ratio, the substance obtained is known as a compound.
A compound has unique properties that are distinct from the properties of its elemental constituents.
Question 2
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Distillation involves :

A
the conversion of a liquid into its vapors upon heating and then cooling the vapor back into liquid.

B
separation of a mixture in which one component is liquid and other is an insoluble solid heavier than liquid.

C
separation of a non-volatile soluble salt from a liquid.

D
none of these.

Solution

Distillation is the process that involves the conversion of a liquid into its vapour upon heating and then cooling the vapour back into liquid.
Question 3
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During hearing of a court case, the judge suspected that some changes in the document had been carried out. He asked the forensic department to check the ink used at two different places. According to you, which technique can give the best results?

A
Column Chromatography

B
Solvent extraction

C
Distillation

D
Thin layer chromatography

Solution

Thin layer chromatography is used to separate the components present in the small amount of the sample.
Question 4
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A pure substance is composed of :

A
one type of particle.

B
two different particles.

C
more than two particles.

D
none of the above.

Solution

A pure substance is a material that has a constant composition and has consistent properties throughout the sample. Since it is made up of one type of particle, it is called a pure substance.
Question 5
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A solution of two liquids whose boiling points are about $$30^{\circ}C$$ different can be seperated by the method of :

A
sublimation

B
distillation

C
sedimentation

D
evaporation

Solution

A solution of two liquids whose boiling points are about 30 $$^∘C $$ different can be separated by the method of distillation. More volatile liquid will distill out first leaving behind the less volatile liquid in the distillation flask.
Question 6
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Distillation is a process of separating the component substances from a liquid mixture by:

A
filteration and condensation.

B
condensation and evaporation.

C
evaporation and filtration.

D
all of above

Solution

Distillation is the process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components of the mixture.
Question 7
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In fractional distillation one or more fractions of compound will:

A
Vaporize

B
Melt

C
Solidify

D
all of above

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 the compound will vaporize.
Question 8
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Which of the following statement is incorrect about compound?

A
A compound is a pure substance composed of two or more elements

B
A compound is combined chemically in fixed proportion

C
A compound is combined chemically in variable proportion

D
All compounds are molecules, but not all molecules are compounds

Solution

Compound is a pure substance made up of two or more elements combined chemically in a definite ratio or fixed proportion.
Hence option $$C$$ is incorrect.
Question 9
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The components of liquid air on passing through a fractional distillation column separate based on:

A
melting point

B
boiling point

C
specific heat

D
density

Solution

The components of liquid air on passing through a fractional distillation column separate based on boiling point. The component with a lower boiling point can be collected from the top of the fractionating column while the component with a higher boiling point is collected from the bottom of the column.
Question 10
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The colored component in blue-black ink are separated through chromatography because:

A
The colored component soluble in water rises faster

B
The colored component insoluble in water rises faster

C
The colored component soluble in water rises slowly

D
None of above

Solution

The color components in ink can be separated by chromatography. It works on the principle that the colored components which are more soluble in the water rise faster and hence the colored components in blue-black ink can be separated.

Option A correct.

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Is Matter Around Us Pure Test - 48

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Is Matter Around Us Pure Test - 48

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Question 1

A compound can be broken into its constituents.

A compound has a fixed composition.

A compound has a distinct set of properties that is not similar to the properties of its constituent elements.

All of the above

Solution

Question 2

the conversion of a liquid into its vapors upon heating and then cooling the vapor back into liquid.

separation of a mixture in which one component is liquid and other is an insoluble solid heavier than liquid.

separation of a non-volatile soluble salt from a liquid.

none of these.

Solution

Question 3

Column Chromatography

Solvent extraction

Distillation

Thin layer chromatography

Solution

Question 4

one type of particle.

two different particles.

more than two particles.

none of the above.

Solution

Question 5

sublimation

distillation

sedimentation

evaporation

Solution

Question 6

filteration and condensation.

condensation and evaporation.

evaporation and filtration.

all of above

Solution

Question 7

Vaporize

Melt

Solidify

all of above

Solution

Question 8

A compound is a pure substance composed of two or more elements

A compound is combined chemically in fixed proportion

A compound is combined chemically in variable proportion

All compounds are molecules, but not all molecules are compounds

Solution

Question 9

melting point

boiling point

specific heat

density

Solution

Question 10

The colored component soluble in water rises faster

The colored component insoluble in water rises faster

The colored component soluble in water rises slowly

None of above

Solution

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