Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Which out of the following is not a homogeneous mixture?

A
Air

B
Brass

C
Solution of sugar in water

D
Smoke

Solution

Homogeneous solutions are solutions with uniform composition and properties throughout the solution.

Carbon particles (solid phase) are dispersed into air (gaseous phase).
Question 2
1 / -0

A mixture of water and acetone is being separated using the apparatus shown. Where will the separated acetone get collected?

A
Q

B
P

C
S

D
R
Question 3
1 / -0

Study the given flowchart carefully and identify P and Q respectively.

A
Compress and cool; Nitrogen

B
Expand and heat; Argon

C
Compress and heat; Oxygen

D
Expand and cool; Oxygen

Solution

Air is converted to liquid air when it is cooled that is kinetic energy decreases and on compressing when no of molecules per unit volume increases.

$$\therefore P$$ is compress and cool.

Liquid air is slowly warmed in fractional distillation column and the vapours liquify as they move up.

Oxygen luquifies at $$-183^{\circ} C$$ , at flows out at the bottom. Nitrogen turns back into gas, at its boiling point is $$-196^{\circ} \mathrm{C}$$. It flows through the pipe connected at top.

Option: $$A$$
Question 4
1 / -0

If the ammonia gas is dissolved in the liquid which is going to be distilled, then after completion of distillation where it will be?

A
Around the thermometer

B
In the condenser

C
In the distillate

D
In the circulating water

E
In the heated flask

Solution

If the ammonia gas is dissolved in the liquid which is going to be distilled and after completion of distillation it will be in the distillate. In the heated flask, the temperature is very high so the solubility of ammonia is minimum. In the distillate the temperature is low. So the solubility of ammonia is high.
Question 5
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Homogeneous mixtures are also called :

A
colloids

B
elements

C
true solutions

D
compound

E
none of these

Solution

A true solution is a homogenous mixture of two or more substances. At least two substances must be mixed to have a solution. The substance in the smallest amount and the one that dissolves or disperses is called the solute. The substance in the larger amount is called the solvent. In most common instances water is the solvent. Gases, liquids or solids dissolved in water are the solutes.
Question 6
1 / -0

Liquids which do not mix with each other are :

A
Solution

B
Miscible

C
Immiscible

D
All of these

E
None of these

Solution
Question 7
1 / -0

Ethyl alcohol is completely miscible with water. It can be separated from this mixture by:

A
Using a separate funnel

B
Evapouration

C
Fractional distillation

D
Allowing the water to evaporate

Solution
Question 8
1 / -0

Chromatography is a word that means "colour writing". It is a technique that can be used to separate the components of a mixture.
In this experiment, a marker was used to make a dot of green ink on a piece of paper. The bottom edge of the paper was placed in water and the water travelled vertically up the paper. As a result, the spot of green ink was separated into two colors: blue and yellow.
Which of the following is the best explanation for the fact that the blue ink moved farther up the paper than the yellow ink in this experiment?

A
The density of blue ink is greater than the density of yellow ink.

B
Blue ink is more soluble in water than yellow ink is.

C
Blue ink has a smaller molar mass than yellow ink.

D
Molecules of blue ink are smaller in size than molecules of yellow ink.

Solution

In chromatography, we are using water as a mobile phase.
So the compound which have more water solubility will travel more distance.
If blue ink moved farther up than the yellow ink that means blue ink is having more water solubility.
Question 9
1 / -0

The disease kalaazar is cured by:

A
colloidal antimony

B
milk of magnesia

C
argyrols

D
colloidal gold

E
colloidal silver

Solution

The disease kala-azar is cured by colloidal antimony.
Colloidal calcium and gold are injected to enhance the vitality of the human body.
Colloidal silver (argyrols and protagol) is used in eye lotion.
Hence, option A is correct.
Question 10
1 / -0

Choose the correct answer form the alternatives given.
A student by chance mixed acetone with alcohol. This mixture of acetone and alcohol can be separated by

A
Filtration

B
Separating funnel

C
Fractional crystallisation

D
Fractional distillation

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 72

Result

Is Matter Around Us Pure Test - 72

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SHARING IS CARING

Question 1

Air

Brass

Solution of sugar in water

Smoke

Solution

Question 2

Q

P

S

R

Question 3

Compress and cool; Nitrogen

Expand and heat; Argon

Compress and heat; Oxygen

Expand and cool; Oxygen

Solution

Question 4

Around the thermometer

In the condenser

In the distillate

In the circulating water

In the heated flask

Solution

Question 5

colloids

elements

true solutions

compound

none of these

Solution

Question 6

Solution

Miscible

Immiscible

All of these

None of these

Solution

Question 7

Using a separate funnel

Evapouration

Fractional distillation

Allowing the water to evaporate

Solution

Question 8

The density of blue ink is greater than the density of yellow ink.

Blue ink is more soluble in water than yellow ink is.

Blue ink has a smaller molar mass than yellow ink.

Molecules of blue ink are smaller in size than molecules of yellow ink.

Solution

Question 9

colloidal antimony

milk of magnesia

argyrols

colloidal gold

colloidal silver

Solution

Question 10

Filtration

Separating funnel

Fractional crystallisation

Fractional distillation

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