Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

This method of separation is called:

A
Fractionation

B
Sublimation

C
Decantation

D
Distillation

Solution

The process depicted in the picture is known as distillation. In distillation, the salt mixture is heated up in a flask and the vapors of the substance having less boiling point produced are condensed in the condenser which is collected in a beaker or flask to separate from the mixture.
Option $$D$$ is correct.
Question 2
1 / -0

Which liquid among water or alcohol, has a lower boiling point (and boils first) and can be used in distillation?

A
Alcohol

B
Water

C
Both have same boiling point

D
None of these

Solution

Among water and alcohol, alcohol has a lower boiling point than water as the hydrogen bonding in alcohol is less compared to water, so the boiling point of alcohol is less than the boiling point of water and can be used in distillation.
Question 3
1 / -0

The boiling point of water collected in the flask after condensation will be:

A
$$0^oC$$

B
$$90^oC$$

C
$$110^oC$$

D
$$100^oC$$

Solution

The water collected after the condensation of steam produced will be pure water free from any kind of impurities like added minerals or any other substance.
Hence. the pure water will have a boiling point of $$100^oC$$.
Question 4
1 / -0

Which technique can be used to separate two liquids with different boiling points?

A
Chromatography

B
Distillation

C
Evaporation

D
Crystallisation

Solution

Distillation is used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and have sufficient differences in their boiling points.
Question 5
1 / -0

In fractionating column of fractional distillation, as the column gets higher:

A
temperature becomes lower

B
temperature becomes higher

C
minimum absorption is carried out

D
risks of sublimation exists
Question 6
1 / -0

How would you know if a solution is saturated?

A
When a sample is taken out and cooled, it forms small crystals rapidly

B
When the sample starts to evaporate

C
When more solid is added, they continue to dissolve in the solution

D
When solution changes colour

Solution

When a sample is taken out and cooled, it forms small crystals rapidly. (At a given temperature, a solution can only hold a certain amount of solute. A saturated solution is one that contains the maximum amount of solute at a given temperature.)
Question 7
1 / -0

Smog refers to:

A
a natural phenomenon

B
a combination of smoke and fog

C
a colourless solid

D
all of the above

Solution

Smog refers to a combination of smoke and fog. Smog is common in industrial sites and is a familiar occurrence in cities today.
Question 8
1 / -0

Dhokla is a __________ type of solution.

A
solid-in-solid

B
solid-in-gas

C
solid-in-liquid

D
gas-in-solid

Solution

Dhokla is a gas-in-solid type of solution.
The dispersed phase is gas (air) and the dispersion medium is solid (material from which dhokla is made).
Question 9
1 / -0

Which of the following statement is true?

A
During distillation, constituents of the flask vapourise

B
During distillation, constituents vapourise in the condenser

C
During distillation, hot water is made to run along the condenser.

D
During distillation, thermometer is not necessary.

Solution

Distillation is a process in which constituents of a liquid mixture are separated by vaporization and condensation. Cool water runs along with the condenser, which allows the vapors rising out of the distillation flask to condense into the liquid form. Also, distillation requires controlled heating, therefore, a thermometer is required.
Question 10
1 / -0

Which of the following is an industrial application of fractional distillation?

A
Identifying poisons or drugs in foodstuffs

B
Sewage treatment

C
Making alcoholic beverages

D
None of these

Solution

Fractional distillation is the process of separation of a mixture into fractions depending upon the boiling points.
Alcoholic beverages contain alcohol, which is produced by fermentation of glucose and collected by fractional distillation.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 62

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Is Matter Around Us Pure Test - 62

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SHARING IS CARING

Question 1

Fractionation

Sublimation

Decantation

Distillation

Solution

Question 2

Alcohol

Water

Both have same boiling point

None of these

Solution

Question 3

$$0^oC$$

$$90^oC$$

$$110^oC$$

$$100^oC$$

Solution

Question 4

Chromatography

Distillation

Evaporation

Crystallisation

Solution

Question 5

temperature becomes lower

temperature becomes higher

minimum absorption is carried out

risks of sublimation exists

Question 6

When a sample is taken out and cooled, it forms small crystals rapidly

When the sample starts to evaporate

When more solid is added, they continue to dissolve in the solution

When solution changes colour

Solution

Question 7

a natural phenomenon

a combination of smoke and fog

a colourless solid

all of the above

Solution

Question 8

solid-in-solid

solid-in-gas

solid-in-liquid

gas-in-solid

Solution

Question 9

During distillation, constituents of the flask vapourise

During distillation, constituents vapourise in the condenser

During distillation, hot water is made to run along the condenser.

During distillation, thermometer is not necessary.

Solution

Question 10

Identifying poisons or drugs in foodstuffs

Sewage treatment

Making alcoholic beverages

None of these

Solution

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