Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 58

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Weekly Quiz Competition

Question 1
1 / -0

When a solution is formed, there are attractions between the solute and the solvent.
Consider a solution formed when solid potassium chloride is dissolved completely into liquid water.
Which of the following particle diagram CORRECTLY represents the way that the particles of the solute (potassium chloride) form attractions toward the molecules of the solvent (water)?

A

B

C

D

Solution

Whenever an ionic solute is dissolved in a solvent, then the charged ions are surrounded by a close spherical cloud of solvent molecules and this is known as an electrophoretic effect.
Option B correctly shows the interactions between solute and water molecules.
Question 2
1 / -0

Ionic solids do not sustain/conduct an electric current in the solid-state but do sustain/conduct an electric current when dissolved in water because:

A
ionic solutes create conductive molecules with water.

B
ionic solutes dissociate in water, creating free moving ions.

C
ionic solutes release electrons when dissolved in water.

D
none of the above.

Solution

Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move. Ionic compounds conduct electricity when molten (liquid) or in an aqueous solution (dissolved in water) because their ions are free to move from place to place.
Question 3
1 / -0

Which method is used to obtain copper sulphate from an impure sample?

A
Hand-picking

B
Fractional Distillation

C
Crystallisation

D
None of the above

Solution

Copper sulphate can be obtained from an impure sample by crystallisation. The impurities will remain in the mother liquor whereas the pure copper sulphate will crystallize out.
Option $$C$$ is correct.
Question 4
1 / -0

Which substances show variations in composition on a particulate and macroscopic level?

A
A pure element.

B
A simple compound.

C
A homogeneous solution.

D
A heterogeneous mixture.

Solution

A heterogeneous mixture shows variations in composition on a particulate and macroscopic level. The composition of the mixture is not uniform.
Question 5
1 / -0

The mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance is called _______.

A
colloidal solution

B
saturated solution

C
unsaturated solution

D
None of above

Solution

A colloid, in chemistry, is a mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance.

Examples of colloids are paint, milk, fog, etc.
Question 6
1 / -0

Statement I (Assertion): Iron is an element.
Statement II (Reason): It cannot be broken into smaller units that retain its physical and chemical properties.

A
Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but reason is correct statement.

E
Both statements are wrong.

Solution

Iron is an element. An element cannot be further divided into smaller units that retain its properties. Thus, iron is an element. Iron is made of iron atoms. The iron atoms cannot be divided further.

Therefore, both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion.
Question 7
1 / -0

Which of these is the solvent used in the case of an 'aqueous' solution?

A
Benzene

B
Ethanol

C
Water

D
Acetone

E
None of these

Solution

When water acts as a solvent in any solution, the solution is termed as aqueous solution.
Question 8
1 / -0

The technique utilized to separate a mixture of liquids based on the difference in their boiling points is

A
distillation

B
chromatography

C
crystallization

D
filtration

E
none of these

Solution

The technique utilized to separate a mixture of liquids based on differences in their boiling points is distillation.

Chromatography is based on the fact that substances that are dissolved in the same solvent can have different solubilities.

Crystallization is also based on solubility. It is basically a method to refine substances based on differences in their solubility.

Filtration is a process which filters the solid particles from a fluid by means of a filter paper. The process is effective if the particles are large enough and do not pass through the filter paper.

So, option A is correct.
Question 9
1 / -0

Which apparatus is used to keep copper sulphate for mixing water during crystallisation?

A
Test tube

B
China dish

C
Beaker

D
Spatula

Solution

China dish is used to keep copper sulphate for mixing water during crystallization.
Note: Impure copper sulphate sample is placed in china dish. It is dissolved in minimum water. The impurities are removed by filtration. The water is evaporated from copper sulphate solution so that saturated solution is obtained. The solution is covered with filter paper and left undisturbed at room temperature. Copper sulphate crystals are obtained in china dish after a day.
Question 10
1 / -0

Depending upon their boiling point different gases from air separated from _____________.

A
same heights

B
different heights

C
less heights

D
none of these

Solution

During fraction distillation of air, gaseous air converts into liquid on high pressure and less temperature which further depending upon their different boiling points get separated at different heights.

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Is Matter Around Us Pure Test - 58

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Is Matter Around Us Pure Test - 58

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Question 1

Solution

Question 2

ionic solutes create conductive molecules with water.

ionic solutes dissociate in water, creating free moving ions.

ionic solutes release electrons when dissolved in water.

none of the above.

Solution

Question 3

Hand-picking

Fractional Distillation

Crystallisation

None of the above

Solution

Question 4

A pure element.

A simple compound.

A homogeneous solution.

A heterogeneous mixture.

Solution

Question 5

colloidal solution

saturated solution

unsaturated solution

None of above

Solution

Question 6

Assertion and reason both are correct statements and reason is correct explanation for assertion.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

Both statements are wrong.

Solution

Question 7

Benzene

Ethanol

Water

Acetone

None of these

Solution

Question 8

distillation

chromatography

crystallization

filtration

none of these

Solution

Question 9

Test tube

China dish

Beaker

Spatula

Solution

Question 10

same heights

different heights

less heights

none of these

Solution

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