Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 56

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Question 1
1 / -0

Why is crystallization better than evaporation to dryness?

A
Solids get charred in evaporation

B
Solids get decomposed in evaporation

C
Impurities do not get removed in evaporation

D
All of above

Solution

Purification by crystallization is a better technique as compared to evaporation by dryness. Some solids like sugar decompose or get charred in evaporation to dryness. Also, impurities are not removed in this method. However, all these drawbacks are overcome in crystallization.
Question 2
1 / -0

Which changes of state occur during distillation?

A
Vapourisation followed by filtration

B
Vapourisation followed by condensation

C
Condensation followed by vapourisation

D
Filtration followed by vapourisation

Solution

Broadly, distillation is a process where vapourisation is followed by condensation. The low boiling liquid vapourises first and then condenses in the condenser.
Question 3
1 / -0

Distillation is a process of separating the component substances from a liquid mixture by:

A
Selective evaporation

B
Condensation

C
both $$A$$ and $$B$$

D
none of the above

Solution

Distillation is the process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components of the mixture. In either case, the process exploits differences in the volatility of mixtures components.
Question 4
1 / -0

If the boiling points of two liquids is close to each other, they are separated by:

A
fractional distillation

B
chromatography

C
steam Distillation

D
differential Extraction

Solution

If the boiling points of two liquids are close to each other, they are separated by fractional distillation. Usually the difference in the boiling points of two liquids to be separated by fractional distillation is 30 deg C or more. Thus, carbon tetrachloride ( b.pt 350 K) and anisole ( b.pt 427 K) can be separated by fractional distillation.
Question 5
1 / -0

What are the characteristics of the solvent used during purification of copper sulphate by crystallization?

A
Not dissolve the substance at room temperature

B
Dissolve the impurities at room temperature

C
Does not dissolve the impurities at high temperature

D
All of the above

Solution

Choosing an appropriate solvent is the important process of crystallisation, as crystallisation works only when a proper solvent is used. It is important to choose a solvent that will not dissolve the substance at room temperature. But as the temperature of the solvent increases, the solubility of the solute also increases. At the same time, the impurities that are present must either be soluble in the solvent at room temperature or must be insoluble in the solvent at a high temperature. If the solvent is not hot when the dissolution is carried out, too much solvent will be used, leading to diminished yield.
Question 6
1 / -0

Distillation works when liquids have:

A
same melting points

B
different melting points

C
different boiling points

D
Both $$B$$ and $$C$$

Solution

Distillation is a process that can be used to separate a pure liquid from a mixture of liquids. It works when the liquids have different boiling points. Distillation is commonly used to separate ethanol - the alcohol in alcoholic drinks - from water.
Question 7
1 / -0

Which of the following is true about distillation?

A
Formation of products occur.

B
There's a change in state of reactants.

C
It is a chemical reaction.

D
It is not a chemical reaction.

Solution

Distillation is used to separate components of a mixture of two miscible liquids having sufficiently high difference in their boiling points. It is a physical separation process and not a chemical reaction as new products are not formed.
Question 8
1 / -0

An installation for distillation, especially of alcohol is a:

A
still

B
distillery

C
distillation column

D
both $$A$$ and $$C$$

Solution

Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation. An installation for distillation, especially of alcohol, is a distillery. The distillation equipment is a still.
Question 9
1 / -0

In fractionating column:

A
vapours of high boiling point substance condense and fall back into a distillation flask

B
vapours of low boiling point substance condense and fall back into a distillation flask

C
vapours of high boiling point substance condense and evaporate

D
both $$B$$ and $$C$$

Solution

If the difference in boiling points of two liquids is less than 25 K, they are separated by the fractional distillation method. A fractionating column is used for fractional distillation where vapors of high boiling point substance condense and fall back into the distillation flask.
Question 10
1 / -0

Because they have different boiling points, the substances in crude oil can be separated using:

A
chromatography

B
fractional distillation

C
sublimation

D
magnetic separation

Solution

Because they have different boiling points, the substances in crude oil can be separated using fractional distillation. The crude oil is evaporated and its vapours are allowed to condense at different temperatures in the fractionating column.

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Is Matter Around Us Pure Test - 56

Result

Is Matter Around Us Pure Test - 56

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SHARING IS CARING

Question 1

Solids get charred in evaporation

Solids get decomposed in evaporation

Impurities do not get removed in evaporation

All of above

Solution

Question 2

Vapourisation followed by filtration

Vapourisation followed by condensation

Condensation followed by vapourisation

Filtration followed by vapourisation

Solution

Question 3

Selective evaporation

Condensation

both $$A$$ and $$B$$

none of the above

Solution

Question 4

fractional distillation

chromatography

steam Distillation

differential Extraction

Solution

Question 5

Not dissolve the substance at room temperature

Dissolve the impurities at room temperature

Does not dissolve the impurities at high temperature

All of the above

Solution

Question 6

same melting points

different melting points

different boiling points

Both $$B$$ and $$C$$

Solution

Question 7

Formation of products occur.

There's a change in state of reactants.

It is a chemical reaction.

It is not a chemical reaction.

Solution

Question 8

still

distillery

distillation column

both $$A$$ and $$C$$

Solution

Question 9

vapours of high boiling point substance condense and fall back into a distillation flask

vapours of low boiling point substance condense and fall back into a distillation flask

vapours of high boiling point substance condense and evaporate

both $$B$$ and $$C$$

Solution

Question 10

chromatography

fractional distillation

sublimation

magnetic separation

Solution

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