Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

In which type of change , we observed alteration only in specific property of matter but not composition ?

A
chemical change

B
physical change operator

C
Both physical and chemical change

D
None of the above

Solution

In a physical change, we observed alteration in specific property of matter but not in composition. Physical change involves only a change in the physical state of matter. Composition and chemical properties remain same.
Hence, oprion B is correct.
Question 2
1 / -0

Baking of dough into bread is a kind of change:

A
That can be reversed

B
That cannot be reversed

C
That can be reversed art very temperature

D
Can't say

Solution

It is an irreversible change. Hence the correct option is B.
Question 3
1 / -0

Identify the chemical changes in the list:
(i) Ripening of fruits
(ii) Fermentation of grapes
(iii) Magnetization of iron

A
Only (i) and (ii)

B
Only (ii) and (iii)

C
Only (i) and (iii)

D
(i), (ii) and (iii)

Solution

Ripening of fruits and fermentation of grapes are chemical changes. These are irreversible and new substances are produced as a result of these. Magnetization of iron is a physical change as no new substances are being formed and it is reversible.
Question 4
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Why is zinc better than tin if we want to protect a piece of iron from rusting by electroplating?

A
Zinc is cheaper than tin.

B
Tin is toxic.

C
Rusting is prevented even when the zinc layer is broken.

D
None of these

Solution

When zinc coating is applied over iron, it undergoes sacrificial anode, an electrochemical process that acts as a physical barrier and protects the iron from corrosion.
But tin has susceptibility to abrasion and mechanical damage easily. Also, zinc is cheaper than tin.
Hence, option A is correct.
Question 5
1 / -0

Rust is a mixture of

A
$$FeO$$ and $$Fe(OH)_3$$

B
$$FeO$$ and $$Fe_3O_4$$

C
$$Fe_2O_3$$ and $$Fe(OH)_3$$

D
$$Fe(OH)_3$$ and $$Fe_3O_4$$

Solution

Rust is a mixture of oxide and hydroxide of $$Iron(III)$$ i.e. rust is mixture of $$Fe_2O_3$$ and $$Fe(OH)_3.$$
Question 6
1 / -0

Which of the following statements is true?

A
Setting of milk to form curd is a chemical and reversible change.

B
Spoiling of food is a chemical and irreversible change.

C
Burning paper is a physical and reversible change.

D
Boiling of an egg is a physical and reversible change.

Solution

Chemical change always produces a new substance and cannot be reversed. The setting of milk to curd, burning of paper, and boiling of egg all are chemical changes and cannot be reversed. In the options, the changes are considered to be reversible, so these statements are not true. Spoiling of food is a chemical change and cannot be reversed. Hence the correct statement is B.
Question 7
1 / -0

Which of the following is a chemical change?

A
Burning of coal

B
Dissolving sugar in water

C
Dissolving salt in water

D
Melting of ice

Solution

A chemical change is the process in which chemical composition of the substance is changed. Burning of coal (that is carbon) in presence of oxygen gives a different chemical substance (carbon dioxide). So, it is a chemical change.
Dissolving sugar or salt in water, and melting of ice are physical changes as no new chemical substances are formed in the process.
Question 8
1 / -0

Digestion of food is which type of change?

A
Chemical

B
Physical

C
Irreversible

D
Reversible

Solution

Digestion of food is a chemical process which includes chewing, action of saliva on food, action of acid on stomach on food, breakdown of food particles.

$$\therefore$$ Option $$A$$ is correct.
Question 9
1 / -0

Spoiling of food is _______ change.

A
Chemical

B
Physical

C
Reversible

D
Irreversible

Solution
Question 10
1 / -0

Magnesium hydroxide $${Mg(OH) }_{ 2 }$$ is used as:

A
fermenting agent

B
flavouring agent

C
antacid

D
none of the above

Solution

Magnesium hydroxide is used as an antacid that relieves indigestion and heartburn. It functions by neutralizing hydrochloric acid present in the stomach to form magnesium chloride and water. Hence option C is correct.

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Physical and Chemical Changes Test - 21

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Physical and Chemical Changes Test - 21

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Question 1

chemical change

physical change operator

Both physical and chemical change

None of the above

Solution

Question 2

That can be reversed

That cannot be reversed

That can be reversed art very temperature

Can't say

Solution

Question 3

Only (i) and (ii)

Only (ii) and (iii)

Only (i) and (iii)

(i), (ii) and (iii)

Solution

Question 4

Zinc is cheaper than tin.

Tin is toxic.

Rusting is prevented even when the zinc layer is broken.

None of these

Solution

Question 5

$$FeO$$ and $$Fe(OH)_3$$

$$FeO$$ and $$Fe_3O_4$$

$$Fe_2O_3$$ and $$Fe(OH)_3$$

$$Fe(OH)_3$$ and $$Fe_3O_4$$

Solution

Question 6

Setting of milk to form curd is a chemical and reversible change.

Spoiling of food is a chemical and irreversible change.

Burning paper is a physical and reversible change.

Boiling of an egg is a physical and reversible change.

Solution

Question 7

Burning of coal

Dissolving sugar in water

Dissolving salt in water

Melting of ice

Solution

Question 8

Chemical

Physical

Irreversible

Reversible

Solution

Question 9

Chemical

Physical

Reversible

Irreversible

Solution

Question 10

fermenting agent

flavouring agent

antacid

none of the above

Solution

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