Physical and Chemical Changes Test

Result

Physical and Chemical Changes Test - 19

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Salt can be obtained by ___________ of sea water.

A
sublimation

B
cooling

C
evaporation

D
heating

Solution

On evaporation of seawater in shallow pools, salt along with impurities remain behind. Impured salt is taken in a tank and its saturated solution is prepared. In a saturated solution of salt, $$HCl$$ vapors are passed. Chloride ions being common to both, its concentration increases, and $$NaCl$$ gets precipitated which is free from impurities.
Question 2
1 / -0

Iron rod turns red on heating. What kind of change is this?

A
Physical change

B
Periodic change

C
Physical and chemical change

D
Chemical change

Solution

Physical changes are changes affecting the physical state of a chemical substance, but not its chemical composition. In the case of iron, when iron is heated it will get red colour but there is no change in its chemical form so it is not a chemical change, it is only a physical change.
Question 3
1 / -0

Chemical formula of rust is

A
$$ FeO $$

B
$$ Fe_3O_4 $$

C
$$ Fe_2O_3.x H_2 O $$

D
$$ FeO .xH_2 O $$

Solution

Chemical formula of rust is $$ Fe_2O_3.x H_2 O $$.
Hence, Option "C" is the correct answer.
Question 4
1 / -0

The diagram shows experiments involving the rusting of iron.
The following results were suggested.
1 In tube $$P$$, the iron nails rust.
2 In tube $$Q$$, the iron nails do not rust.
3 In tube $$R$$, the iron nails do not rust.
Which results are correct?

A
$$1$$ and $$2$$ only

B
$$1$$ and $$3$$ only

C
$$2$$ and $$3$$ only

D
$$1, 2$$ and $$3$$
Question 5
1 / -0

Which is an example of a chemical change?

A
The melting of ice

B
The burning of wood

C
The grindig of salt crystals powder

D
The evaporation of water from a sea

Solution

A change in which a new substance is formed is called a chemical change.
Examples of chemical change are digestion of food, ripening of fruit, burning of wood.
The burning of wood is a chemical change because it is always accompanied by the production of heat.
Melting of ice grinding of salt crystals to powder and evaporation of water from the sea are all physical changes because no new substances are formed.
Question 6
1 / -0

A student is given a mixture of barium sulfate, copper(II) sulfate and water.
The table shows information about barium sulfate and copper(II) sulfate.

Substance Solubility in water State at room temperature
Barium sulfate Insoluble Solid
Copper(II) sulfate Soluble Solid

How does the student obtain copper(II) sulfate crystals from the mixture?

A
Crystallisation followed by distillation

B
Crystallisation followed by filtration

C
Distillation followed by crystallisation

D
Filtration followed by crystallisation

Solution

Filtration uses a filter paper or fine porous ceramic to separate an insoluble solid from a liquid. Thus, insoluble barium sulfate solid will be separated from the mixer of the solution by filtration.
Now, soluble copper sulfate from the filtrate solution can be separated by the process of crystallisation.
Question 7
1 / -0

Which of the following is a physical change?

A
Rusting of iron

B
Combustion of magnesium ribbon

C
Burning of candle

D
Melting of wax

Solution

Rusting of iron, combustion of magnesium ribbon, burning of a candle are chemical changes while melting of wax is a physical change.
Question 8
1 / -0

Two drops of dilute sulphuric acid were added to $$1g$$ of copper sulphate and then a small amount of hot water was added to dissolve it (step I). On cooling beautiful blue coloured crystals got separated (step II).Step(I) and step (II) are:

A
Physical and chemical changes respectively.

B
Chemical and physical changes respectively.

C
Both are physical changes.

D
Both are chemical changes.

Solution

The correct option is (C).
Dissolution of copper sulphate powder in water in presence of sulphuric acid is a physical change. On cooling this hot solution, crystals of copper sulphate separate, which is also a physical change. As there is no change in the chemical composition of copper sulphate, only a change in its physical state.
Question 9
1 / -0

Paheli's mother made concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates:

A
Physical change that can be reversed

B
Chemical change that can be reversed

C
Physical change that cannot be reversed

D
Chemical change that cannot be reversed

Solution

This is a physical change as there is not any new substance formed having different chemical composition and properties. Only the state of the substance is changed during the process and it can be reversed.
Question 10
1 / -0

Which of the following is a chemical change?

A
Twinkling of stars

B
Cooking of vegetables

C
Cutting of fruits

D
Boiling of water

Solution

The correct option is (B), cooking of vegetables. That's because the substances in vegetables change into new substances upon heating.

Twinkling of stars, cutting of fruits and boiling of water are physical changes.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Substance	Solubility in water	State at room temperature
Barium sulfate	Insoluble	Solid
Copper(II) sulfate	Soluble	Solid

Physical and Chemical Changes Test - 19

Result

Physical and Chemical Changes Test - 19

Score

-

Rank

-

SHARING IS CARING

Question 1

sublimation

cooling

evaporation

heating

Solution

Question 2

Physical change

Periodic change

Physical and chemical change

Chemical change

Solution

Question 3

$$ FeO $$

$$ Fe_3O_4 $$

$$ Fe_2O_3.x H_2 O $$

$$ FeO .xH_2 O $$

Solution

Question 4

$$1$$ and $$2$$ only

$$1$$ and $$3$$ only

$$2$$ and $$3$$ only

$$1, 2$$ and $$3$$

Question 5

The melting of ice

The burning of wood

The grindig of salt crystals powder

The evaporation of water from a sea

Solution

Question 6

Crystallisation followed by distillation

Crystallisation followed by filtration

Distillation followed by crystallisation

Filtration followed by crystallisation

Solution

Question 7

Rusting of iron

Combustion of magnesium ribbon

Burning of candle

Melting of wax

Solution

Question 8

Physical and chemical changes respectively.

Chemical and physical changes respectively.

Both are physical changes.

Both are chemical changes.

Solution

Question 9

Physical change that can be reversed

Chemical change that can be reversed

Physical change that cannot be reversed

Chemical change that cannot be reversed

Solution

Question 10

Twinkling of stars

Cooking of vegetables

Cutting of fruits

Boiling of water

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.