Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

A chemical change may involve-

A
Change in colour only

B
Change in temperature only

C
Evolution of gas only

D
All of the above

Solution

The chemical change may involve a change in color, temperature, or evolution of gas.
Hence, the correct answer is D.
Question 2
1 / -0

Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

A
(i) and (ii)

B
(ii) and (iii)

C
(iii) and (iv)

D
(i) and (iv)

Solution

Burning and decay result in the formation of new substances and they cannot be reversed and change the chemical composition of wood. Hence, they are chemical changes.
Sawing of wood and hammering of a nail into a piece of wood are physical changes as they do not change the chemical composition of wood.
Hence option (A) is correct.
Question 3
1 / -0

Choose the most appropriate answer:

Physical changes are:

A
permanent

B
periodic

C
temporary

D
irreversible

Solution

Physical changes are temporary in nature. It does not affect the internal structure of a substance, only the molecules are rearranged. No new substance is formed.
Question 4
1 / -0

Choose the most appropriate answer:

Chemical changes involve;

A
change in shape

B
change in size

C
change in molecular composition

D
none of these

Solution

Chemical changes occur when bonds are broken or formed between molecules or atoms. This means that one substance with a certain set of properties is turned into a different substance with different properties.
So, chemical changes involve change in molecular composition.
Option C is correct.
Question 5
1 / -0

Chemical change involve

A
change in shape

B
change in size

C
change in composition of atoms.

D
none of these

Solution

Chemical change involves a change in the composition of atoms which also means a new substance is formed.
Changes in shape and size are physical changes.
Hence, Option $$C$$ is the correct answer.
Question 6
1 / -0

Physical changes are:

A

those in which new substance is not formed.

B
those in which a new substance is formed.

C
always irreversible.

D
None of the above

Solution

In a physical change, the substance remains the same. A new substance is not formed. It is generally reversible. For instance, folding of paper.
Question 7
1 / -0

The chemical formula of rust is?

A
$$Fe_{2}O_{3}$$

B
$$Fe$$

C
$$FeO$$

D
$$FeSO_{4}$$

Solution

Rust is iron oxide $$(Fe_2O_3)$$. It is formed when iron reacts with oxygen in the presence of moisture.

$$Iron\ (Fe) + Oxygen\ (O_2) + Water\ (H_2O) \rightarrow Rust\ (Fe_2O_3)$$
Question 8
1 / -0

Crystallisation is a:

A
chemical change

B
physical change

C
irreversible change

D
All the above

Solution

Crystallisation is a physical change as it does not result in the formation of a new substance. Moreover, the change is reversible because crystals formed in the process can be changed back to non-crystalline form by dissolving in water.
Question 9
1 / -0

Which of the following is not a chemical change?

A
Baking of cake

B
Ripening of fruits

C
Formation of clouds

D
Rancidity of butter

Solution

Generally, chemical change is irreversible change. Baking of cake, ripening of fruits, rancidity of butter all are irreversible change or can say chemical change.
Formation of clouds is physical change as after raining, water again transformed into clouds by evaporation process.
Question 10
1 / -0

Identify the chemical change in the following :

A
Freezing of water

B
Rusting of iron

C
Melting of wax

D
Glowing of a bulb

Solution

Rusting of iron is chemical change while others are physical changes.
Option $$B$$ is correct.

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Physical and Chemical Changes Test - 20

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Physical and Chemical Changes Test - 20

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Question 1

Change in colour only

Change in temperature only

Evolution of gas only

All of the above

Solution

Question 2

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

Solution

Question 3

permanent

periodic

temporary

irreversible

Solution

Question 4

change in shape

change in size

change in molecular composition

none of these

Solution

Question 5

change in shape

change in size

change in composition of atoms.

none of these

Solution

Question 6

those in which new substance is not formed.

those in which a new substance is formed.

always irreversible.

None of the above

Solution

Question 7

$$Fe_{2}O_{3}$$

$$Fe$$

$$FeO$$

$$FeSO_{4}$$

Solution

Question 8

chemical change

physical change

irreversible change

All the above

Solution

Question 9

Baking of cake

Ripening of fruits

Formation of clouds

Rancidity of butter

Solution

Question 10

Freezing of water

Rusting of iron

Melting of wax

Glowing of a bulb

Solution

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