Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 69

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Weekly Quiz Competition

Question 1
1 / -0

Tyndall effect observed as a result of scattering of light by particles is observed in

A
Suspension

B
Colloidal solution

C
True solution

D
None of these

Solution

The Tyndall effect is due to the fact that colloidal particles scatter light in all directions in space. This scattering of light illuminates the path of the beam in the colloidal dispersion.
Question 2
1 / -0

The size of particles in suspension, true the solution and colloidal solution varies in order.

A
$$ Suspension> Colloidal> True solution $$

B
$$ Suspension> \left ( Colloidal+ True solution \right ) $$

C
$$ True solution> Suspension> Colloidal $$

D
None of these

Solution

$$ Suspension> Colloidal> True solution $$
Question 3
1 / -0

Which is a colloid?

A
Sugar solution

B
Soda water

C
Milk

D
NaCl solution

Solution

A solution in which the size of the particle is intermediate between true solution and suspension is called colloid.
Examples of colloids are soap solution, blood, milk, etc.
A colloid is a heterogeneous mixture whereas sugar solution, soda water, and $$NaCl$$ solution are homogeneous mixtures.
Question 4
1 / -0

Which of the following are compounds?
$$(i)$$ $$CO $$
$$(ii)$$ $$Na $$
$$(iii)$$ $$NO $$
$$(iv)$$ $$Co$$

A
$$(i)\ and\ (ii)$$

B
$$(ii)\ and\ (iii)$$

C
$$(i)\ and\ (iii)$$

D
$$(ii)\ and\ (iv)$$

Solution

A compound is an electrically neutral group of two or more atoms of different elements held together by chemical bonds.

$$NO$$ and $$CO$$ are compounds since they are made up of atoms of two different elements.

Whereas, $$Na$$ and $$Co$$ are made up of one type of atom and are elements.
Question 5
1 / -0

Which of the following statement are true for pure substances?
(i) Pure substances contain only one kind of particles.
(ii) Pure substances may be compounds or mixtures.
(iii) Pure substances have the same composition throughout.
(iv) Pure Substances can be exemplified by all elements other than nickel.

A
(i) and (ii)

B
(i) and (iii)

C
(iii) and (iv)

D
(ii) and (iii)

Solution

Pure substances contain only one kind of particle and have the same composition throughout. Hence statements (i) and (iii) are true.
Pure substances may be elements or compounds. Mixtures are not pure substances, hence option (ii) is False.
Pure substances can be exemplified by all elements, including nickel. Hence option (iv) is false.
Therefore, option B is the correct answer for this question.
Question 6
1 / -0

When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide then heat energy is :

A
Released

B
First absorbed and then released

C
Absorbed

D
Neither absorbed nor released

Solution

When a mixture of iron and sulphur is heated strongly, they first absorb the energy to get excited. This is followed by the formation of a new compound iron sulphide (FeS) with the release of the huge amount of energy in the form of heat and light.
Question 7
1 / -0

Which of the following materials fall in the category of a "pure substance"?

A
Ice, milk and iron

B
$$CaO,CO_2$$ and $$NaCl$$

C
Brick, mercury and wood

D
$$\text{Iron}, CaO \text{ and Air}$$

Solution

Pure substances are those in which all the constituent particles present in them are the same and identical in chemical nature.
Elements and compounds are examples of pure substances.
$$CaO, CO2, NaCl$$ are examples of compounds.
Air, milk. brick and wood fall under impure substances.
Question 8
1 / -0

Which of the following procedures will give you water free from all impurities?

A
Adding chlorine tablets

B
Distillation

C
Boiling

D
Filtration

Solution

To get rid of all the impurities from water, it is distilled and the process is known as distillation.
Hence, Option "B" is correct answer.
Question 9
1 / -0

Which of these is used for the separation of two miscible liquids that have sufficient difference in their boiling points?

A
Evaporation

B
Distillation

C
Alteration

D
Crystallisation
Solution
Distillation is used to separate miscible liquids based on the high difference in their boiling points.
Evaporation is used to separate a non-volatile solute from a volatile solvent.
Alteration is not a method of separation.
Crystallisation is used to separate a pure solid in the form of its crystals from a solution.
Question 10
1 / -0

Components of crude petroleum can be separated by :

A
simple distillation

B
hand picking

C
filtration

D
fractional distillation

Solution

$$Fractional \;distillation$$ is the separation of a mixture into its parts or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate.
Crude petroleum is a mixture of many different components that have varied boiling points.
hence option $$(D)$$ is correct.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 69

Result

Is Matter Around Us Pure Test - 69

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SHARING IS CARING

Question 1

Suspension

Colloidal solution

True solution

None of these

Solution

Question 2

$$ Suspension> Colloidal> True solution $$

$$ Suspension> \left ( Colloidal+ True solution \right ) $$

$$ True solution> Suspension> Colloidal $$

None of these

Solution

Question 3

Sugar solution

Soda water

Milk

NaCl solution

Solution

Question 4

$$(i)\ and\ (ii)$$

$$(ii)\ and\ (iii)$$

$$(i)\ and\ (iii)$$

$$(ii)\ and\ (iv)$$

Solution

Question 5

(i) and (ii)

(i) and (iii)

(iii) and (iv)

(ii) and (iii)

Solution

Question 6

Released

First absorbed and then released

Absorbed

Neither absorbed nor released

Solution

Question 7

Ice, milk and iron

$$CaO,CO_2$$ and $$NaCl$$

Brick, mercury and wood

$$\text{Iron}, CaO \text{ and Air}$$

Solution

Question 8

Adding chlorine tablets

Distillation

Boiling

Filtration

Solution

Question 9

Evaporation

Distillation

Alteration

Crystallisation

Solution

Question 10

simple distillation

hand picking

filtration

fractional distillation

Solution

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