Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

One of most common solvent used for crystallization is:

A
Syrup

B
Normal saline

C
Water

D
Sulphuric acid
Question 2
1 / -0

Insoluble impurities from solution during crystallization are removed by :

A
drying

B
filtration

C
heating

D
cooling

Solution

Heating is the process of increasing the temperature of a body from its original temperature.
Cooling is the process of decreasing the temperature of a body from its original temperature.
Filtration is the process of separating small particles of solid matter from a liquid, by causing the liquid to pass through the pores of some substance, called a filter.
Insoluble impurities from solution during crystallization are removed by filtration as the insoluble solid particles passed through the filter.
Drying is the process of drying up the liquid present on any material by heating the material.
Option B is correct.
Question 3
1 / -0

Large crystals of pure substances can be formed from their solutions during ____________.

A
crystallization

B
evaporation

C
expansion

D
contraction

Solution

Large crystals of pure substances can be formed from their solutions during crystallization.
For example, when hot acidic copper sulfate solution is cooled gradually, the crystals of copper sulfate are obtained.
Question 4
1 / -0

Which of the following is/are true when milk changes into curd?
(i) Its state is changed from liquid to semi-solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.

A
$$i, ii$$

B
$$ii, iii$$

C
$$i, iii, iv$$

D
$$i, iv$$

Solution

$$(i)$$ Milk is in the liquid state and curd is semi-solid. Hence, first statement is true.
$$(ii)$$ Colour remains the same when milk changes to curd. Both are white in colour.
$$(iii)$$ There is a change in the taste when milk changes to curd.
$$(iv)$$ As it is a chemical change, it can't be reversed.

$$\therefore $$ $$i, iii, iv$$ are correct.
Question 5
1 / -0

Changes in which only ____________ properties of a substance change are called physical changes.

A
chemical

B
physical

C
biological

D
environmental
Question 6
1 / -0

Chemical changes are:

A
those that are reversible

B
those in which new substances are formed

C
those that do not release heat

D
All of these

Solution

Chemical changes are those in which new substances are produced. They are mostly irreversible and some do release heat while some absorb heat.
Question 7
1 / -0

Anaerobic bacteria digest animal waste and produce biogas(Process-A). The biogas is then burnt as fuel(Process-B). The following statements pertain to these changes. Choose the correct one.

A
Process-A is a chemical change and process B is a physical change.

B
Process-B is a chemical change and process A is a physical change.

C
Both processes A and B are chemical changes.

D
None of these processes is a chemical change.

Solution

$$\textbf{Concept:}$$ Physical Change: Properties like size, shape, state (solid, liquid, or gas), temperature, pressure, etc., are physical properties. Those changes in which only physical properties of a substance change are called physical changes. There is no change in chemical composition.
Chemical Change: The change in which a new substance is formed and the chemical composition of a substance are changed is called a chemical change. A substance loses its identity in a chemical change and cannot get back into its original form.
$$\textbf{Correct Option:}$$ C

$$\textbf{Explanation for correct option:}$$ Change A and change B both are chemical changes. As both the reaction are irreversible and they lead to the formation of new substances. There is also a change in the chemical properties of the reactants in both processes A and B.
Animal waste $$\xrightarrow[bacteria] { anaerobic } $$ Bio gas ($$CH_4$$)
Bio gas $$\xrightarrow { burning } \quad { CO }_{ 2 }+ other \ substances.$$

$$\textbf{Explanation for incorrect options:}$$ according to given explanation both processes A and B are chemical changes.
Hence, correct option is C.
Question 8
1 / -0

Brown colour formation in an exposed apple after it's cut is:

A
physical change

B
chemical change

C
reversible change

D
no change

Solution

The brown colour of the apple after cutting is due to the chemical change of the enzymes. When an apple is cut, oxygen is introduced into the exposed part and so, it changes colour. This is not a reversible change.
Question 9
1 / -0

The process of obtaining salt by evaporation of seawater is known as :

A
crystallization

B
sedimentation

C
galvanization

D
amalgamation

Solution

It is known as crystallization - because salt is obtained in crystal form.
Sedimentation is depositing solid as sediment.
Galvanization - is the process of protecting iron/metal by a coating of zinc.
Amalgamation - is the formation of amalgam (an alloy of mercury with another metal).
Question 10
1 / -0

Conversion of milk into curd is :

A
a physical property of milk

B
a chemical property of milk

C
a physical change

D
a chemical change

Solution

When milk converts in curd the process is irreversible and a new substance with different properties is formed hence it is an example of a chemical change.

Hence option D is correct.

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Physical and Chemical Changes Test - 16

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Physical and Chemical Changes Test - 16

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Question 1

Syrup

Normal saline

Water

Sulphuric acid

Question 2

drying

filtration

heating

cooling

Solution

Question 3

crystallization

evaporation

expansion

contraction

Solution

Question 4

$$i, ii$$

$$ii, iii$$

$$i, iii, iv$$

$$i, iv$$

Solution

Question 5

chemical

physical

biological

environmental

Question 6

those that are reversible

those in which new substances are formed

those that do not release heat

All of these

Solution

Question 7

Process-A is a chemical change and process B is a physical change.

Process-B is a chemical change and process A is a physical change.

Both processes A and B are chemical changes.

None of these processes is a chemical change.

Solution

Question 8

physical change

chemical change

reversible change

no change

Solution

Question 9

crystallization

sedimentation

galvanization

amalgamation

Solution

Question 10

a physical property of milk

a chemical property of milk

a physical change

a chemical change

Solution

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