Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following are impure substances?

A
elements

B
compounds

C
mixtures

D
none of these

Solution

Mixtures are impure substances as they do not contain particles of similar type. For example, cement is not a pure substance as it is made up of particles of lime, water, etc.

Hence, the correct option is $\text{C}$ .
Question 2
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The basic form of matter which cannot be further subdivided into simpler substances is called as ______.

A
compound

B
element

C
mixture

D
None of these

Solution

The basic form of matter which cannot be further subdivided into any simpler substances are elements. They are the basic unit of the matter.
Example: iron, copper, sodium, etc.
Question 3
1 / -0

Which of the following is impure substance?

A
salt

B
sugar

C
milk

D
sulpuric acid

Solution

Impure substances are made up of different-different particles. Here milk is an impure substance as it contains proteins, lactose, calcium, water, fats, etc. All the others are pure substances as they are made up of a similar type of particles.
Question 4
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Based on the chemical properties, the matter can be classified as ________.

A
elements

B
compounds

C
mixture

D
All of these

Solution

On the basis of chemical properties, matter is classified as elements, compounds and mixtures.
Question 5
1 / -0

Air is a _________________.

A
homogeneous mixture

B
heterogeneous mixture

C
compound

D
none of these

Solution

Air is a mixture of different gases. The mixture of gases always forms a homogeneous mixture. Air consist of different gases such as oxygen, nitrogen, carbon dioxide, etc.
Hence, option $A$ is correct.
Question 6
1 / -0

_________ is present in greater quantity in a solution.

A
Solute

B
Solvent

C
Salt

D
Sugar

E
None of these

Solution

Option $B$ is the correct answer.
According to the definition, the component which is present in greater quantity in a solution is termed as $\text solvent$ .
Option $B$ is correct.
Question 7
1 / -0

Which of the following is one of the types of an element?

A
Metal

B
Nonmetal

C
Metalloid

D
All of these

Solution

Elements are divided into three types, they are metals, nonmetals, and metalloids.
These three types of elements are classified on the basis of their physical and chemical properties.
So the correct option is $D$ .
Question 8
1 / -0

All pure substances have:

A
the same physical state.

B
the same colour.

C
the same composition.

D
a definite set of properties.

Solution

All pure substances have the same composition.

For example, Water is a pure substance in which hydrogen and oxygen combines in definite proportion by mass.

Hence, option C is correct.
Question 9
1 / -0

What would you observe when a saturated solution of potassium chloride prepared at $60^0 C$ is allowed to cool to room temperature?

A
Crystallization happens

B
Evaporation happens

C
Sublimation happens

D
Condensation happens

Solution

Here crystallization happens and solid potassium chloride will separate out. (Crystallization is a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs)
Question 10
1 / -0

While diluting a solution of salt in water, a student by mistake added acetone (boiling point $56^o\ C$ ). What technique can be employed to get back the acetone?

A
Distillation

B
Separation

C
Condensation

D
Evaporation

Solution

Distillation can be employed to get back the acetone, since acetone is more volatile it will separate out first.
(Distillation is a process that can be used to separate a pure liquid from a mixture of liquids. It works when the liquids have different boiling points. Distillation is commonly used to separate ethanol - the alcohol in alcoholic drinks - from water. The mixture is heated in a flask.)

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Is Matter Around Us Pure Test - 23

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Is Matter Around Us Pure Test - 23

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SHARING IS CARING

Question 1

elements

compounds

mixtures

none of these

Solution

Question 2

compound

element

mixture

None of these

Solution

Question 3

salt

sugar

milk

sulpuric acid

Solution

Question 4

elements

compounds

mixture

All of these

Solution

Question 5

homogeneous mixture

heterogeneous mixture

compound

none of these

Solution

Question 6

Solute

Solvent

Salt

Sugar

None of these

Solution

Question 7

Metal

Nonmetal

Metalloid

All of these

Solution

Question 8

the same physical state.

the same colour.

the same composition.

a definite set of properties.

Solution

Question 9

Crystallization happens

Evaporation happens

Sublimation happens

Condensation happens

Solution

Question 10

Distillation

Separation

Condensation

Evaporation

Solution

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