Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 51

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not a property of pure substances?

A
Homogenous

B
Definite composition

C
They have fixed melting and boiling points

D
They can be broken down into simpler substances by physical means

Solution

A pure substance has the same type of particles with fixed melting and boiling point. It has a definite composition and is, therefore, homogeneous in nature.

A compound is a pure substance that can be broken down into simpler substances by chemical means whereas elements can not be broken down into simpler substances by either physical or chemical means.
Therefore, option D is correct.
Question 2
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Which of the following is not a pure substance?

A
Aerated water

B
Carbon dioxide

C
Oxygen

D
Zinc

Solution

Aerated water is a homogeneous mixture of carbon dioxide and water. It is not a pure substance. Carbon dioxide is a compound while oxygen and zinc are elements which are a type of pure substance.
Question 3
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Which of the following is intermediate between suspension and solution?

A
Mixture

B
Colloid

C
Element

D
Solvent

Solution

Colloidal solutions are heterogeneous mixture of two or more substances. They appear homogeneous. The size of colloids is between the size of particles of solution and suspension, i.e., between 1 nanometer to 1000 nanometer.
Question 4
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A suspension of liquid droplets or fine solid particles in a gas is called as:

A
aerosol

B
foam

C
emulsion

D
gel

Solution

A suspension of liquid droplets or fine solid particles in a gas is called an aerosol or particulate.
Aerosol is of two types: liquid aerosol and solid aerosol.
Question 5
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Separating funnel is used for :

A
separation of miscible liquids

B
separation of immiscible liquids

C
separation of immiscible gases

D
all of above

Solution

A separating funnel is used to separate two immiscible liquids. When two immiscible liquids are placed in a separating funnel two different layers of liquids are seen. The liquid which has more density will present at the bottom and hence can be separated from another liquid.
Question 6
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Which of the following has liquid as a dispersing medium?

A
Aerosol

B
Gel

C
Foam

D
Cranberry glass

Solution

Mixtures are called foam when liquid is present as dispersing medium and gas is a dispersed medium. For example, shaving cream, soap bubbles, etc.
option $$C$$ is correct.
Question 7
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Why are suspensions not stable?

A
Particles are very small

B
Particles settle at the bottom

C
Particles do not settle

D
Particles mix homogeneously

Solution

Suspensions are a heterogeneous mixture. When the suspension is left for some time, particles get settled in the bottom because they are heavy, larger, and have less movement thus settle down due to gravity. Therefore, suspension is not stable.
Question 8
1 / -0

Suspension shows Tyndall effect because of :

A
large size of particles

B
small size of particles

C
their settling down nature

D
none of above

Solution

Suspension shows the Tyndall effect because of their large size of particles. Particles of suspension are large enough to scatter rays of light and the path of the ray is visible through a suspension.
Question 9
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Which of the following turns into gas first and separates from air?

A
Nitrogen

B
Oxygen

C
Argon

D
Helium

Solution

The liquefied air is passed into the bottom of a fractionating column. The liquid nitrogen boils at the bottom of the column. Gaseous nitrogen rises to the top, where it is piped off and stored. Liquid nitrogen has boiling point equal to $$- 190^oC$$, and thus, turns into gas first and separated from air.
Question 10
1 / -0

Which of the following gas is removed from air during liquefaction stage?

A
Oxygen

B
Carbon dioxide

C
Hydrogen

D
Nitrogen

Solution

Air comprises of nitrogen, oxygen, carbon dioxide, and argon as major components. After liquefaction of air by repeated compression and cooling, nitrogen, oxygen, carbon dioxide, and argon are extracted using fractional distillation. Carbon dioxide turns into solid at a temperature of $$-97^oC$$, therefore, it is removed while air is put under liquefaction.

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Is Matter Around Us Pure Test - 51

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Is Matter Around Us Pure Test - 51

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Question 1

Homogenous

Definite composition

They have fixed melting and boiling points

They can be broken down into simpler substances by physical means

Solution

Question 2

Aerated water

Carbon dioxide

Oxygen

Zinc

Solution

Question 3

Mixture

Colloid

Element

Solvent

Solution

Question 4

aerosol

foam

emulsion

gel

Solution

Question 5

separation of miscible liquids

separation of immiscible liquids

separation of immiscible gases

all of above

Solution

Question 6

Aerosol

Gel

Foam

Cranberry glass

Solution

Question 7

Particles are very small

Particles settle at the bottom

Particles do not settle

Particles mix homogeneously

Solution

Question 8

large size of particles

small size of particles

their settling down nature

none of above

Solution

Question 9

Nitrogen

Oxygen

Argon

Helium

Solution

Question 10

Oxygen

Carbon dioxide

Hydrogen

Nitrogen

Solution

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