Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 3

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Question 1
1 / -0

Which of the following is not a characteristic of catalyst?

A
It can accelerate a reaction process.

B
It can decrease a reaction process.

C
It is influenced by promoters.

D
Catalyst undergoes change at the end of a reaction.
Question 2
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What type of change occurs on conversion of iron metal into nails and screws?

A
Chemical change

B
Compositional change

C
Physical change

D
Thermal change
Question 3
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Which of the following is applicable to chemical change?

A
Mass of final substance is greater than that of initial substance.

B
Mass of final substance is less than that of initial substance.

C
Mass of final substance may be less or more than that of initial substance.

D
Mass of final substance is equal to that of initial substance.
Question 4
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Consider the following physical change:

18 g of ice is converted into steam by heating and then this 18 g of steam is cooled to water, and then further cooled to form ice again.

Which of the following statements is true about the above change?

A
Energy is gained in the process.

B
Energy is lost in the process.

C
There is no net energy change.

D
There are other factors that affect net energy change.
Question 5
1 / -0

When ice is heated, which of the following changes does not occur?

A
Change in shape

B
Change in composition

C
Change in size

D
Change in physical state
Question 6
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Which observation denotes chemical change for the process of sublimation of ammonium chloride, NH₄Cl NH₃ + HCl?
(i)    Solid ammonium chloride vaporises
(ii)    Partial dissociation of ammonium chloride
(iii)   Ammonium and hydrogen chloride recombine to ammonium chloride
(iv)   Ammonium chloride vapours solidify

A
(i) and (ii)

B
(ii) and (iii)

C
(iii) and (iv)

D
(iii) only
Question 7
1 / -0

What happens when electric current is passed through acidulated water in voltmeter?

A
Hydrogen and hydroxide are formed.

B
Hydrogen and peroxide are formed.

C
Hydrogen and oxygen gases are formed.

D
Water is converted into hydrogen peroxide.
Question 8
1 / -0

Which of the following are chemical changes?
(i) Electrolysis of water
(ii) Breaking of glass
(iii) Crystallisation of sugar
(iv) Heating of sugar

A
(i) and (iii)

B
(ii) and (iii)

C
(i) and (iv)

D
(iii) and (iv)
Question 9
1 / -0

Which of the following statements cannot be applied to evaporation?

A
It is temporary.

B
It is reversible.

C
There is no change in mass.

D
New substance is created.
Question 10
1 / -0

What can be inferred from the following statement?
'When sugar is dissolved in water, the solution becomes sweet. But the same sugar is obtained on removal of water by evaporation.`

A
No new substance is formed.

B
Chemical change is occurring.

C
Boiling point of water is lower.

D
Sugar has high boiling point.
Question 11
1 / -0

What type of change occurs on conversion of milk into curd, and when milk is kept in a warm place?

A
Physical

B
Biological

C
Chemical

D
Thermal
Question 12
1 / -0

Which of the following is not a property of iron rust?

A
Dull brown black in colour

B
Brittle in nature

C
Poor conductor of heat

D
Liberates hydrogen, when HCl is poured on it
Question 13
1 / -0

What happens when sugar crystals are heated in a dry test tube?

A
Pale yellow liquid is formed.

B
First turns brown and finally changes to black.

C
First turns orange and finally changes to brown.

D
Sugar crystals are liquefied to colourless liquid.
Question 14
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Which of the following statements is true?

A
A physical change is irreversible; a chemical change is reversible.

B
Physical change is permanent; chemical change is temporary.

C
Composition remains unchanged during a physical change,composition changes during a chemical change.

D
Mass of the substance changes during a physical change; mass of the substance remains unchanged during a chemical change.
Question 15
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What type of change(s) occur(s) on heating zinc hydroxide?

A
Physical only

B
Chemical only

C
Physical and chemical

D
Physical and thermal
Question 16
1 / -0

Which of the following is not a physical change?

A
Formation of dew

B
Rusting of iron

C
Drying of wet clothes

D
Glowing of bulb
Question 17
1 / -0

What is true about rusting of iron?

A
It is temporary.

B
It is reversible.

C
New substances are formed.

D
Composition remains unchanged.
Question 18
1 / -0

Which of the following is not true about burning of wood?

A
New substances; H₂O and CO₂ are formed.

B
Heat and light energies are evolved.

C
Change in mass of wood does not occur.

D
Change is permanent and immiscible.
Question 19
1 / -0

Which of the following can be categorized under a physical change?

(i) Crystallisation of salt
(ii) Burning of wood
(iii) Magnetising iron
(iv) Ripening of fruits

A
(i) and (ii)

B
(ii) and (iii)

C
(i) and (iii)

D
(i) and (iv)
Question 20
1 / -0

Which of the following processes involves both chemical and physical changes?

A
Burning of wood

B
Burning of candle

C
Decay of matter

D
Melting of solids

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Physical and Chemical Changes Test - 3

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Physical and Chemical Changes Test - 3

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Question 1

It can accelerate a reaction process.

It can decrease a reaction process.

It is influenced by promoters.

Catalyst undergoes change at the end of a reaction.

Question 2

Chemical change

Compositional change

Physical change

Thermal change

Question 3

Mass of final substance is greater than that of initial substance.

Mass of final substance is less than that of initial substance.

Mass of final substance may be less or more than that of initial substance.

Mass of final substance is equal to that of initial substance.

Question 4

Energy is gained in the process.

Energy is lost in the process.

There is no net energy change.

There are other factors that affect net energy change.

Question 5

Change in shape

Change in composition

Change in size

Change in physical state

Question 6

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(iii) only

Question 7

Hydrogen and hydroxide are formed.

Hydrogen and peroxide are formed.

Hydrogen and oxygen gases are formed.

Water is converted into hydrogen peroxide.

Question 8

(i) and (iii)

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

Question 9

It is temporary.

It is reversible.

There is no change in mass.

New substance is created.

Question 10

No new substance is formed.

Chemical change is occurring.

Boiling point of water is lower.

Sugar has high boiling point.

Question 11

Physical

Biological

Chemical

Thermal

Question 12

Dull brown black in colour

Brittle in nature

Poor conductor of heat

Liberates hydrogen, when HCl is poured on it

Question 13

Pale yellow liquid is formed.

First turns brown and finally changes to black.

First turns orange and finally changes to brown.

Sugar crystals are liquefied to colourless liquid.

Question 14

A physical change is irreversible; a chemical change is reversible.

Physical change is permanent; chemical change is temporary.

Composition remains unchanged during a physical change,composition changes during a chemical change.

Mass of the substance changes during a physical change; mass of the substance remains unchanged during a chemical change.

Question 15

Physical only

New substances; H₂O and CO₂ are formed.