Pure And Impure Matter Test

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Pure And Impure Matter Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Common salt is an example of

A
compound

B
mixture

C
element

D
None of the above

Solution

Sodium chloride (NaCl), also known as common salt or halite, is an ionic compound with the chemical formula NaCl, representing a 1 : 1 ratio of sodium and chloride ions.
Question 2
1 / -0

Which of the following is an element?

A
Ruby

B
Sapphire

C
Emerald

D
Diamond

Solution

Diamond is an allotropic form of the element carbon.
Hence, option (4) is correct.
Question 3
1 / -0

Example of an element is

A
air

B
chlorine

C
water

D
sulphur dioxide

Solution

Chlorine is an element. Air is a mixture, whereas water and sulphur dioxide are examples of compounds.
Question 4
1 / -0

Glass has the elements:

A
Hg, Si, O₂ and N₂

B
Na, Si and O₂

C
H₂, O₂ and C

D
Si, C and O₂

Solution

The most common constituent of glass is silica (SiO₂) along with compounds like Na₂CO₃, CaCO₃, etc.
A common form of glass is Na₂SiO₃.
Question 5
1 / -0

Which of the following is a polyatomic element?

A
Sulphur

B
Aluminium

C
argon

D
neon

Solution

Sulphur is a polyatomic element.
Question 6
1 / -0

Which of the following is a compound?

A
Milk

B
Air

C
Helium

D
Water

Solution

Water is a compound.
Question 7
1 / -0

The symbol for potassium is

A
Pt

B
K

C
P

D
I

Solution

The symbol for potassium is K.
Question 8
1 / -0

Which of the following is highly compressible?

A
Copper

B
Bromine

C
Oxygen

D
Iron

Solution

As oxygen is a gas and gases are highly compressible in nature.
Question 9
1 / -0

Why does balloon burst with a sound when it is pricked with a needle?

A
Because of force exerted by the needle.

B
Because of force exerted by gas present in the balloon.

C
Because of decreasing kinetic energy of gas.

D
Because of high temperature inside the balloon.

Solution

On pricking the balloon with a needle, the gas in the balloon expands with a sound.
The expansion work done by the gas is converted into sound energy.
Question 10
1 / -0

Which of the following has the highest kinetic energy?

A
Solid

B
Liquid

C
Gas

D
Plasma

Solution

Plasma is a fourth state of matter, which has the highest kinetic energy. It is a state of matter in which an ionized gaseous substance becomes highly electrically conductive.
Question 11
1 / -0

Which of the following can be separated by the methods of sedimentation and decantation?

A
Mixture of NaCl and H₂O

B
Mixture of sugar and H₂O

C
Mixture of sand and H₂O

D
Mixture of salt and H₂O

Solution

Mixture of sand and water can be separated by the methods of sedimentation and decantation.
Question 12
1 / -0

By which method can you separate a mixture of NaCl and water?

A
Sublimation

B
Distillation

C
Solvent extraction

D
Liquefaction

Solution

Mixture of NaCl and water can be separated by distillation as distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation.
Question 13
1 / -0

A compound is made up of elements X and Y. The equivalent weight of X is one-fourth its atomic weight and the equivalent weight of Y is half its atomic weight. Therefore, the formula of the compound is

A
XY

B
XY₂

C
X₂Y

D
X₄Y₂

Solution

A compound is made of elements X and Y. The equivalent weight of X is one-fourth its atomic weight and the equivalent weight of Y is half its atomic weight. Therefore, the formula of the compound is XY₂.
Question 14
1 / -0

Chemical formula for water glass is

A
Ca₂SiO₃

B
Na₂SiO₃

C
NaAIO₃

D
AI₂O₃

Solution

Chemical formula for water glass is Na₂SiO₃.
Question 15
1 / -0

Dead burnt plaster is

A
CaSO₄.2H₂O

B
(CaSO₄)₂.H₂O

C
CaSO₄

D
2CaSO₄.H₂O

Solution

Dead burnt plaster is CaSO₄.
Question 16
1 / -0

Which of the following is the formula for ferric sulphate?

A
FeSO₄

B
Fe (SO₄)₂

C
Fe₃ SO₄

D
Fe₂ (SO₄)₃

Solution

The formula for ferric sulphate is Fe₂(SO₄)₃.
Question 17
1 / -0

The formula for aluminium chloride is Al_aCl_b, where a and b have the values

A
1 and 3

B
1 and 4

C
6 and 2

D
2 and 3

Solution

In the formula for aluminium chloride Al_aCl_b, the respective values of a and b are 1 and 3 (i.e. AlCl₃).
Question 18
1 / -0

When iron filings are heated in a steam of dry hydrogen chloride, the compound formed is FeCl_x, where 'x' is

A
1

B
2

C
3

D
4

Solution

When iron filings are heated in a steam of dry hydrogen chloride, the compound formed is FeCl₂.
Question 19
1 / -0

Chemical name of 'Blue Vitriol' is

A
ferrous sulphate

B
zinc sulphate

C
copper sulphate

D
iodine

Solution

Chemical name of 'blue vitriol' is copper sulphate.
Question 20
1 / -0

What is the molecular formula of glucose?

A
CH₂O

B
C₆H₁₂O₆

C
C₆H₆

D
Ca(OH)₂

Solution

The molecular formula of glucose is C₆H₁₂O₆.

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Pure And Impure Matter Test - 5

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Question 1

compound

mixture

element

None of the above

Solution

Question 2

Ruby

Sapphire

Emerald

Diamond

Solution

Question 3

air

chlorine

water

sulphur dioxide

Solution

Question 4

Hg, Si, O2 and N2

Na, Si and O2

H2, O2 and C

Si, C and O2

Solution

Question 5

Sulphur

Aluminium

argon

neon

Solution

Question 6

Milk

Air

Helium

Water

Solution

Question 7

Pt

K

P

I

Solution

Question 8

Copper

Bromine

Oxygen

Iron

Solution

Question 9

Because of force exerted by the needle.

Because of force exerted by gas present in the balloon.

Because of decreasing kinetic energy of gas.

Because of high temperature inside the balloon.

Solution

Question 10

Solid

Liquid

Gas

Plasma

Solution

Question 11

Mixture of NaCl and H2O

Mixture of sugar and H2O

Mixture of sand and H2O

Mixture of salt and H2O

Solution

Question 12

Sublimation

Distillation

Solvent extraction

Liquefaction

Solution

Hg, Si, O₂ and N₂

Na, Si and O₂

H₂, O₂ and C

Si, C and O₂

Mixture of NaCl and H₂O

Mixture of sugar and H₂O

Mixture of sand and H₂O

Mixture of salt and H₂O

XY₂

X₂Y

X₄Y₂

Ca₂SiO₃

Na₂SiO₃

NaAIO₃

AI₂O₃

CaSO₄.2H₂O

(CaSO₄)₂.H₂O

CaSO₄

2CaSO₄.H₂O

FeSO₄

Fe (SO₄)₂

Fe₃ SO₄

Fe₂ (SO₄)₃

CH₂O

C₆H₁₂O₆

C₆H₆

Ca(OH)₂