Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

The components of a mixture of two miscible liquids having boiling differing by $$25^o$$C or more can be separated by :

A
chromatography

B
simple distillation

C
separating funnel

D
sublimation

Solution

The components of a mixture containing two miscible liquids having boiling points differing by more than $$25 ^oC$$ can be separated by the method of simple distillation.
Question 2
1 / -0

Formation of a compound involves ___________ of energy

A
absorption

B
evolution

C
A or B

D
None of the above

Solution

The formation of a compound involves the absorption or evolution of energy such as heat, light or electricity.

For example - Carbon reacts with oxygen forming $$CO_2$$ along with the liberation of heat.
On the other hand, photosynthesis is an endothermic reaction where plants make glucose and oxygen from carbon dioxide and water by absorbing sun's energy.
So, option C is correct.
Question 3
1 / -0

Coloured components of a mixture can be separated by a technique called :

A
Chromatography

B
Centrifugation

C
Dissolution

D
Crystallization

Solution

Colored components of a mixture can be separated by a technique called chromatography. Chromatography was developed by Tswelt in 1903. Kroma in Greek means color. This process of separation of components of a mixture is known as chromatography. Kroma in Greek means colour. This technique was first used for the separation of colours, so this name was given.
Question 4
1 / -0

Compounds are

A
pure

B
impure

C
both A and B

D
none of the above

Solution

The compound is made up of only one kind of molecule. Molecule forming the compound cannot be separated by physical methods. Hence compounds are pure substances. So option A is correct.
Question 5
1 / -0

A compound is a pure substance made up of two or more elements combined chemically in a _______ proportion by _______ :

A
variable, volume

B
definite, mass

C
constant, weight

D
Both B and C

Solution

A compound is a pure substance made up of two or more substances combined chemical in a definite (or constant) proportion by mass (or weight). When two or more elements combine chemically to form a new substance called a compound.
Hence, options B and C both are correct.
Question 6
1 / -0

Why are compounds commonly known as chemical compounds?

A
They are studied in chemistry

B
They are formed due to a chemical reactions between two or more elements

C
These are used as reagents in chemistry

D
All of the above

Solution

Two or more elements combine together chemically to form a new substance called compound. Compounds are commonly termed as chemical compounds because these are formed due to a chemical reaction.
Question 7
1 / -0

Separation of two immiscible liquids is based on :

A
difference in the solubility of the two liquids.

B
difference in the densities of the two liquids.

C
difference in melting point of the two liquids.

D
difference in boiling point of the two liquids.

Solution

The separation of two immiscible liquids is based on the difference in the densities of the two liquids. The method is used for separating two immiscible liquids, such as oil and water.
Hence, option $$B$$ is correct.
Question 8
1 / -0

How much water should be added to 20 g of sugar to obtain 20% sugar solution?

A
80 g

B
20 g

C
120 g

D
None of the above

Solution

20% sugar solution means 20 g sugar in 100 g solution.
Amount of water $$=100 g - 20 g = 80 g$$
Option A is correct.
Question 9
1 / -0

Two or more elements combine together chemically to form a new substance called :

A
compound

B
element

C
mixture

D
dispersion phase

Solution

According to the definition of compounds, two or more elements combine together chemical to form a new substance called compound. Compounds are commonly termed as chemical compounds.
Question 10
1 / -0

Muddy pond water and chalk suspended in water are examples of a:

A
colloid

B
suspension

C
true solution

D
none of the above

Solution

The particles of mud in muddy water and particles of chalk in water are large enough to be seen with the naked eyes. These particles settle down to the bottom when left undisturbed. These properties point to the fact that these are examples of suspensions.
Hence, option $$B$$ is correct.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 40

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Is Matter Around Us Pure Test - 40

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Question 1

chromatography

simple distillation

separating funnel

sublimation

Solution

Question 2

absorption

evolution

A or B

None of the above

Solution

Question 3

Chromatography

Centrifugation

Dissolution

Crystallization

Solution

Question 4

pure

impure

both A and B

none of the above

Solution

Question 5

variable, volume

definite, mass

constant, weight

Both B and C

Solution

Question 6

They are studied in chemistry

They are formed due to a chemical reactions between two or more elements

These are used as reagents in chemistry

All of the above

Solution

Question 7

difference in the solubility of the two liquids.

difference in the densities of the two liquids.

difference in melting point of the two liquids.

difference in boiling point of the two liquids.

Solution

Question 8

80 g

20 g

120 g

None of the above

Solution

Question 9

compound

element

mixture

dispersion phase

Solution

Question 10

colloid

suspension

true solution

none of the above

Solution

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