Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Ethanol is separated form water by:

A
Crystallisation

B
Chromatography

C
Fractional distillation

D
Adding methyl alcohol

Solution

Fractional distillation is special type of distillation designed to separate a mixture of two or more liquids that have different boiling points.Ethanol is more volatile than water, since it has a lower boiling point (78°C) and thus mixture of ethanol and water can be seperated by the method of fractional distillation.
Question 2
1 / -0

Which of the following is an example of a mixture?

A
Sugar

B
Brass

C
$${ CO }_{ 2 }$$

D
$${ NO }_{ 2 }$$

Solution

Brass is an alloy made up of copper and zinc and the proportions of copper and zinc can be varied to create a range of brasses with varying properties. So it is a mixture.
Question 3
1 / -0

The low boiling metals are purified by:

A
distillation

B
poling

C
liquation

D
slag

Solution

Distillation is a method of separating mixtures based on differences in their volatiles in a boiling liquid mixture. In this method the component substances are separated from their liquid mixture by selective evaporation and condensation. It may result in complete separation or partial separation.
Question 4
1 / -0

Soil is an example of :

A
Homogeneous Mixture

B
Element

C
Compound

D
Heterogeneous Mixture

Solution

Soil is a heterogeneous mixture of minerals, organic matter, gases, liquids and the countless organisms that together support life on earth.

Hence, option $$D$$ is correct.
Question 5
1 / -0

Brass is an example of a:

A
homogeneous compound.

B
homogeneous mixture.

C
heterogeneous mixture.

D
heterogeneous compound.

Solution

Brass is an alloy made up of uniform composition of copper and zinc. It is a homogeneous mixture in which zinc and copper can be varied to create a range of brasses with varying properties.
Question 6
1 / -0

The process which is employed to separate the mixture of two miscible liquids differing in their boiling points is:

A
fractional distillation

B
distillation

C
evaporation

D
decantation

Solution

Fractional distillation is the separation of a mixture into its parts, or fractions, separating chemical compounds by their boiling point by heating them to a temperature at which one or more fractions of the compound will vaporize.
For example. alcohol and water are miscible liquids but both are having different boiling points i.e. 78°C & 100°C respectively. So for their separation, fractional distillation has to be carried out.
Question 7
1 / -0

Which of the following is a characteristic of both mixtures and compounds?

A
They contain components in fixed proportions.

B
Their properties are the same as those of their components.

C
Their weight equals the sum of the weights of their components.

D
Energy is given out when they are made.

Solution

Mixtures and compounds both follow the law of conservation of mass, so their weight equals the sum of the weights of their components.

A compound is formed as a result of the chemical reaction between the constituent elements. But it's properties do not remain the same as those of its elements.

For a mixture, the components are not present in fixed proportions. Moreover, energy is not given out when it is made.

Only option 'C' applies to both mixtures and compounds.
Question 8
1 / -0

A mixture of sand and iodine can be separated by:

A
distillation

B
fractionation

C
sublimation

D
filtration

Solution

Sand and iodine can be separated by the process of sublimation. It is a process in which a solid converts directly into a gas without converting it into a liquid.
Iodine sublimates on heating whereas sand does not and hence can be easily separated using sublimation.
Question 9
1 / -0

Compounds may be formed by:

A
decomposition of other compounds

B
combination of elements

C
combination of compounds

D
all of the above methods

Solution

A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass. And also compound is formed as a result of chemical reaction between the constituent elements.
Decomposition of compound is also a chemcal reaction.
Question 10
1 / -0

Which of the following is a homogeneous mixture?

A
Milk

B
Steel

C
Smoke

D
Soil
Solution
$$\bf{Hint:}$$ A homogeneous mixture is composed of components that are uniform with fixed composition and proportions.

$$\bf{Correct \ answer:}$$ Option $$B$$

$$\bf{Explanation \ for \ correct \ option:}$$

A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture.
Steel is an alloy of iron and carbon as both are present in elemental form and solid in nature therefore , steel is a homogeneous mixture of both iron and carbon with uniform composition throughout.

$$\bf{Explanation \ for \ incorrect \ options:}$$
Milk is an example of oil in water emulsion. Therefore, Milk is an heterogeneous mixture.
Smoke is a heterogeneous mixture of solids in a fluid /gaseous medium.
Soil is heterogeneous mixture because it has pebbles, plant matter and sand in it.

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Is Matter Around Us Pure Test - 36

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Is Matter Around Us Pure Test - 36

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SHARING IS CARING

Question 1

Crystallisation

Chromatography

Fractional distillation

Adding methyl alcohol

Solution

Question 2

Sugar

Brass

$${ CO }_{ 2 }$$

$${ NO }_{ 2 }$$

Solution

Question 3

distillation

poling

liquation

slag

Solution

Question 4

Homogeneous Mixture

Element

Compound

Heterogeneous Mixture

Solution

Question 5

homogeneous compound.

homogeneous mixture.

heterogeneous mixture.

heterogeneous compound.

Solution

Question 6

fractional distillation

distillation

evaporation

decantation

Solution

Question 7

They contain components in fixed proportions.

Their properties are the same as those of their components.

Their weight equals the sum of the weights of their components.

Energy is given out when they are made.

Solution

Question 8

distillation

fractionation

sublimation

filtration

Solution

Question 9

decomposition of other compounds

combination of elements

combination of compounds

all of the above methods

Solution

Question 10

Milk

Steel

Smoke

Soil

Solution

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