Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following methods can be used to obtain pure water from a solution of salt in water?

A
Filtration

B
Distillation

C
Decantation

D
Electrolysis

Solution

Distillation can be used to obtain pure water from a solution of salt in water.
During distillation, water is evaporated by heating and the water vapors are condensed and collected in the receiving flask. Salt remains in the distillation flask.
Question 2
1 / -0

Salt dissolves in water to form salt solution. Name of the solvent is:

A
salt

B
water

C
salt-water

D
salt and water

Solution

Salt is dissolved in water to form salt-water. Here salt is present as a solute and water as a solvent. Salt-water is the solution.
Question 3
1 / -0

Sugar dissolves in water to form sugar solution. Name the solvent.

A
Sugar

B
Water

C
Sugar-water

D
None of the above

Solution

Sugar dissolves in water to form sugar solution. Here sugar is solute and water is solvent.
Hence, option B is correct.
Question 4
1 / -0

The percentage of oxygen in the atmosphere is _________.

A
27

B
21

C
23

D
19

Solution

Air is a homogeneous mixture of several gases. Two main components are oxygen (21%) and nitrogen (78%).
Question 5
1 / -0

Sugar dissolves in water to form sugar solution. What is the name of the solute?

A
Sugar

B
Water

C
Sugar-water

D
None of these

Solution

Sugar dissolves in water to form a sugar solution.

Here, sugar is solute and water is solvent.

Hence, option A is correct.
Question 6
1 / -0

The crystals that are obtained after crystallization are:

A
more than 90% pure

B
between 40% and 80% pure

C
between 10% to 40% pure

D
10% pure

Solution

Crystal is the purest form of a compound, the method of forming crystals is known as crystallization. Crystals are more than $$90 \%$$ pure and their purity can be increased up to $$99.9 \%$$ by the recrystallization technique.
Question 7
1 / -0

Which of the following mixtures will be the most difficult to separate?

A
Iron filings + sand

B
Sand + water

C
Saw dust + stones

D
Nitrogen gas + hydrogen gas

Solution

Iron filings + Sand can be separated by magnetic separation method.
Sand + water can be separated by decantation method because sand particles is heavy and settles at the bottom and can be separated by this method.
Saw dust + stones can be separated by using hand picking method.
But separating a gaseous mixture is very difficult because this is a homogenous mixture.
Hence, option $$D$$ is correct. $$\mathrm {Nitrogen \ gas + hydrogen \ gas}$$
Question 8
1 / -0

A liquid that is two times heavier than water is mixed with another liquid that is lighter than water. What is the easiest way to separate these two liquids?

A
Filtration

B
Separating funnel

C
Evaporation

D
Distillation

Solution

These two liquids can be easily separated using a Separating funnel.
A separating funnel is a piece of laboratory glassware, used to separate the components of a liquid mixture having components with different densities. Component with higher density goes to the bottom of the separating funnel and the lower density component remains on the top of the denser component and can hence be separated easily.

Hence option $$B$$ is correct.
Question 9
1 / -0

Vinegar is a solution of acetic acid in water, it is:

A
a homogeneous solid in liquid mixture

B
a heterogeneous liquid in liquid mixture

C
a homogeneous liquid in liquid mixture

D
none of the above

Solution

Vinegar is a solution of acetic acid in water.It is a homogenous liquid in liquid mixture.
Question 10
1 / -0

The metals present in brass are______and_______.

A
iron, zinc

B
copper, tin

C
copper, zinc

D
aluminium, magnesium

Solution

Brass consists of two metals: copper (approximately 70%) and zinc (approximately 30%). It is an alloy, which is a solid homogeneous mixture.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 37

Result

Is Matter Around Us Pure Test - 37

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SHARING IS CARING

Question 1

Filtration

Distillation

Decantation

Electrolysis

Solution

Question 2

salt

water

salt-water

salt and water

Solution

Question 3

Sugar

Water

Sugar-water

None of the above

Solution

Question 4

27

21

23

19

Solution

Question 5

Sugar

Water

Sugar-water

None of these

Solution

Question 6

more than 90% pure

between 40% and 80% pure

between 10% to 40% pure

10% pure

Solution

Question 7

Iron filings + sand

Sand + water

Saw dust + stones

Nitrogen gas + hydrogen gas

Solution

Question 8

Filtration

Separating funnel

Evaporation

Distillation

Solution

Question 9

a homogeneous solid in liquid mixture

a heterogeneous liquid in liquid mixture

a homogeneous liquid in liquid mixture

none of the above

Solution

Question 10

iron, zinc

copper, tin

copper, zinc

aluminium, magnesium

Solution

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