Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

A solution in which solvent is liquid but solute is solid is :

A
sugar in water

B
urea in water

C
ammonium chloride in water

D
all of the above

Solution

Sugar is a solid and is a solute in sugar water solution. Urea is also a solid and a solute. Ammonium chloride is also a solid solute.
Question 2
1 / -0

Which technique is used to separate the components of liquid air?

A
Fractional distillation

B
Simple distillation

C
Centrifugation

D
Evaporation

Solution

Since the boiling point of nitrogen and oxygen are very close to each other, hence, fractional distillation is used to separate the components of liquid air.
Question 3
1 / -0

The solute particles in a true liquid solution:

A
settle down

B
spread uniformly throughout

C
float on the surface

D
None of the above

Solution

Particles in a true solution do not settle down and spread uniformly across the solution. Thus, a true solution is clear and transparent.
So, option B is correct.
Question 4
1 / -0

Which is/are the correct statement(s) among the following:
I) A true solution is clear and transparent.
II) A true solution does not scatter light.
III) Components of a true solution cannot be separated by filtration.

A
I

B
I, II

C
I,III

D
I, II, III

Solution

A true solution is a homogeneous mixture. The particle size of a true solution is less than $$1 nm$$. Hence, a true solution is clear and transparent. It does not scatter light. Components of a true solution cannot be separated by filtration as they can easily pass through a filter paper.
Question 5
1 / -0

Why do we use fractional distillation instead of simple distillation for separating the components of air?

A
Because fractional distillation is cheaper

B
Because fractional distillation is easier to use

C
Because the difference in boiling point of components are less than $$20\ K$$

D
Because the difference in melting point of components are less than $$20\ K$$
Question 6
1 / -0

Colloids are classified on the basis of :

A
Nature of dispersed phase and dispersion medium

B
Phase of solution

C
Temperature of solution

D
None of the above

Solution

Colloids are classified on the basis of nature of dispersed phase and dispersion medium, like gel, sol, foam, emulsion etc.
Question 7
1 / -0

In smoke, cheese, milk of magnesia and fog, the dispersion medium is :

A
gas, solid, liquid, and gas respectively

B
liquid

C
liquid, gas, solid, and liquid respectively

D
gas

Solution

Smoke is a solid aerosol, the dispersed phase is solid and the dispersion medium is gas.
Cheese is a gel and the dispersed phase in it is liquid and the dispersion medium is solid.
Milk of magnesia is a sol, the dispersed phase is solid and the dispersion medium is liquid.
Fog is a liquid aerosol. the dispersed phase is liquid and the dispersion medium is gas.
Question 8
1 / -0

What are the following ways of expressing concentration of a solution called?

I) $$\dfrac{Mass \ of\ solute}{Mass\ of\ solution} \times 100$$

II) $$\dfrac{Mass\ of\ solute}{Volume\ of \ solution} \times 100$$

A
(I) Mass by mass percentage, (II) Mass by volume percentage

B
(I) Volume by volume percentage, (II) Mass by volume percentage

C
(I) Mass by volume percentage, (II) Volume by volume percentage

D
None of the above

Solution

There are various ways of expressing the concentration of a solution.

(I) Concentration in terms of mass by mass percentage $$=\dfrac{Mass\ of\ solute}{Mass\ of\ solution} \times 100$$

II) Concentration in terms of mass by volume percentage $$=\dfrac{Mass\ of \ solute}{Volume\ of\ solution} \times 100$$

III) Concentration in terms of volume by volume percentage $$=\dfrac{Volume\ of \ solute}{Volume\ of\ solution} \times 100$$
Question 9
1 / -0

Foam is a:

A
true solution

B
colloid

C
emulsion

D
gel

Solution

Foam is a type of colloid. Foam colloids can have gas as dispersed phase and solid as dispersing medium (example: rubber and sponge), or it can have gas as dispersed phase and liquid as dispersing medium (example: shaving cream).
Question 10
1 / -0

In fractional distillation, difference in boiling points of components should be:

A
$$25^oC$$

B
more than $$25^oC$$

C
less than $$25^oC$$

D
less than $$35^oC$$

Solution

Fractional distillation is the separation of a mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which one or more fractions of the compound will vaporize.

It is a special type of distillation. Generally the component parts boil at less than $$25^oC$$ from each other under a pressure of one atmosphere.

Option C is correct.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 47

Result

Is Matter Around Us Pure Test - 47

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SHARING IS CARING

Question 1

sugar in water

urea in water

ammonium chloride in water

all of the above

Solution

Question 2

Fractional distillation

Simple distillation

Centrifugation

Evaporation

Solution

Question 3

settle down

spread uniformly throughout

float on the surface

None of the above

Solution

Question 4

I

I, II

I,III

I, II, III

Solution

Question 5

Because fractional distillation is cheaper

Because fractional distillation is easier to use

Because the difference in boiling point of components are less than $$20\ K$$

Because the difference in melting point of components are less than $$20\ K$$

Question 6

Nature of dispersed phase and dispersion medium

Phase of solution

Temperature of solution

None of the above

Solution

Question 7

gas, solid, liquid, and gas respectively

liquid

liquid, gas, solid, and liquid respectively

gas

Solution

Question 8

(I) Mass by mass percentage, (II) Mass by volume percentage

(I) Volume by volume percentage, (II) Mass by volume percentage

(I) Mass by volume percentage, (II) Volume by volume percentage

None of the above

Solution

Question 9

true solution

colloid

emulsion

gel

Solution

Question 10

$$25^oC$$

more than $$25^oC$$

less than $$25^oC$$

less than $$35^oC$$

Solution

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