Physical and Chemical Changes Test

Result

Physical and Chemical Changes Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Rust is a hydrated oxide of iron which is

A
Reddish brown

B
Green

C
White

D
Black

Solution

Rusting of iron occurs in the presence of air and water to convert iron into hydrated iron oxide i.e. rust.
Rust is chemically $$Fe_2O_3.xH_2O$$ and it is reddish-brown in color.
Question 2
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To prevent rusting, the underside of the ships is coated with:

A
nitric acid

B
phosphoric

C
oxygen

D
red lead oxide paint

Solution

Rusting will result in form exposure with moisture. It can be prevented by using red lead oxide paint. It is usually used for the inhibition of corrosion in the underside part of the ship.

The correct option is D.
Question 3
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Which of these is a physical change?

A
Melting of wax

B
Fermentation

C
Formation of salt solution

D
Boiling of an egg

Solution

Melting of wax is a physical change because no new substance is formed in the change. The other three options are chemical changes as new substances are formed.
Question 4
1 / -0

The process of retting in jute is

A
Microbilological

B
Purely chemical

C
Purely physical

D
Bio-chemical

Solution

Process of retting is purely physical. Retting is a process in which the tied bundles of jute stalks are taken by which fibres get loosened and separated from the woody stalk.
Question 5
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The process in which substances undergo change to produce new substances with new properties are-

A
Chemical changes

B
Physical reactions

C
It is depend on condition

D
None of the above

Solution

Chemical changes occur when a substance combines with another to form a new substance.
Physical changes occur when objects or substances undergo a change that does not change their chemical composition.
hence correct option is A

Question 6

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Match column I with column II and select the correct option from the codes given below.

Column I	Column II
(P) Expansion of metals on heating	(i) Neither physical nor chemical change
(Q) A stone kept in the sunlight	(ii) Chemical change
(R) Burning of a candle	(iii) Combination of physical nor chemical changes
(S) Curdling of milk	(iv) Physical change

(P) - (iv), (Q) - (i), (R) - (iii), (S) - (ii)

(P) - (iv), (Q) - (iii), (R) - (ii), (S) - (i)

(P) - (i), (Q) - (ii), (R) - (iii), (S) - (iv)

(P) - (i), (Q) - (iv), (R) - (ii), (S) - (iii)

Solution

P. Metals expand on heating and contract on cooling. During expansion or contraction, chemical properties of the metal remains unchanged. The only change is in the intermolecular spacing which is a physical change.

Q. Stone kept in sunlight remains same. It neither change physically nor chemically.

R. When candle burns, melting of wax is physical change while burning material is chemical change.

S. Curdling of milk is a chemical change as chemical behaviour of milk is changed.

Question 7
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Why are doors painted in our house?

A
To protect them from sun rays

B
To make them dust proof

C
To prevent them rusting

D
To protect them from birds

Solution

Rusting is the process of the formation of iron oxide when iron, water, and oxygen come in contact. Painting a door creates a barrier between iron, oxygen, and water, in turn, reduces the chances of rusting. Thus the option C is correct.
Question 8
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An example of chemical change is:

A
switching on of bulb

B
milky change of lime water

C
water changes into water vapour

D
melting of ghee

Solution

In chemical changes, there is a change in the chemical composition of the substances. Milky change of lime water is a chemical change. When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes lime water milky.

$$Carbon\ dioxide + Lime\ water \rightarrow Calcium\ carbonate + Water$$

The other changes like switching on of a bulb, changing of water into water vapour and melting of ghee are physical changes because no new substance is formed in these changes.
Question 9
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An example of physical change is:

A
rusting

B
melting of ice

C
formation of curd

D
browning of apple after cutting
Question 10
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The piece of alum becomes bigger when another piece of alum is suspended in its solution. This process is known as:

A
Ionisation

B
Transformation

C
Crystallisation

D
Polymorphism

Solution

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Physical and Chemical Changes Test - 22

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Physical and Chemical Changes Test - 22

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SHARING IS CARING

Question 1

Reddish brown

Green

White

Black

Solution

Question 2

nitric acid

phosphoric

oxygen

red lead oxide paint

Solution

Question 3

Melting of wax

Fermentation

Formation of salt solution

Boiling of an egg

Solution

Question 4

Microbilological

Purely chemical

Purely physical

Bio-chemical

Solution

Question 5

Chemical changes

Physical reactions

It is depend on condition

None of the above

Solution

Question 6

(P) - (iv), (Q) - (i), (R) - (iii), (S) - (ii)

(P) - (iv), (Q) - (iii), (R) - (ii), (S) - (i)

(P) - (i), (Q) - (ii), (R) - (iii), (S) - (iv)

(P) - (i), (Q) - (iv), (R) - (ii), (S) - (iii)

Solution

Question 7

To protect them from sun rays

To make them dust proof

To prevent them rusting

To protect them from birds

Solution

Question 8

switching on of bulb

milky change of lime water

water changes into water vapour

melting of ghee

Solution

Question 9

rusting

melting of ice

formation of curd

browning of apple after cutting

Question 10

Ionisation

Transformation

Crystallisation

Polymorphism

Solution

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