Solution, Mixtures And Separation Methods Test

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Solution, Mixtures And Separation Methods Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following papers is used for separating a mixture of coloured materials?

A
Filter paper

B
Ordinary paper

C
Chromatography paper

D
Micro filter paper

Solution

Paper chromatography is used as a qualitative analytical chemistry technique for identifying and separating coloured mixtures like pigments. It is used in scientific studies to identify unknown organic and inorganic compounds from a mixture.
Question 2
1 / -0

The impure common salt obtained from sea water is purified with the help of

A
sublimation

B
evaporation

C
distillation

D
crystallisation

Solution

Crystallisation is a process that separates a pure solid in the form of its crystals from a solution. This method is used to purify solid; for example, the salt we get from sea water can have many impurities in it. To remove these impurities, the process of crystallisation is used.
Question 3
1 / -0

A mixture of fine suspended particles in liquid can be separated very rapidly with the help of

A
filtration using a filter paper

B
distillation

C
fractional distillation

D
centrifugation
Question 4
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Which of the following methods is used in washing machines to dry clothes?

A
Evaporation

B
Centrifugation

C
Distillation

D
Chromatography

Solution

Centrifugation is the process where a mixture is separated through spinning. It is used to separate skim milk from whole milk, water from clothes, and blood cells from blood plasma.
Question 5
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Which of the following can be separated from a mixture using sublimation method?

A
Common salt

B
Sulphur

C
Iron filings

D
Camphor

Solution

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. Camphor is a sublimable substance, so it can be separated from a mixture using sublimation method.
Question 6
1 / -0

Which of the following options does not represent a physical change?

A
Curd formation

B
Formation of clouds

C
Growth of a plant

D
Dissolving common salt in water
Question 7
1 / -0

In which of the following colloids tiny solid particles are dispersed in a liquid medium?

A
Solid foam

B
Emulsion

C
Solid sol

D
Sol
Question 8
1 / -0

Which of the following options is an example of sol?

A
Shaving cream

B
Butter

C
Fog

D
Soap solution
Question 9
1 / -0

A colloid in which _______ is dispersed in _______ is called a foam.

A
a solid or liquid, a gas

B
a gas, a solid medium

C
a gas, a liquid medium

D
liquid, another liquid
Question 10
1 / -0

Which of the following colloids is an example of an emulsion?

A
Milk

B
Shaving cream

C
Gelatin

D
Soap bubbles
Question 11
1 / -0

Which of the following will not show Tyndall effect?

A
Vinegar

B
Blood

C
Ink

D
Smoke
Question 12
1 / -0

Which of the following statements is true about the physical changes and chemical changes?

A
During a chemical change the reactants form products of equal mass.

B
The physical changes can not be reversed.

C
The chemical changes can be reversed.

D
In physical changes a new substance is formed and energy is either liberted or absorbed.
Question 13
1 / -0

Which of the following processes is not an example of a physical change in water?

A
Heating of water to its boiling point.

B
Formation of liquid water by cooling of water vapour or by heating of ice.

C
Cooling of water to its freezing point.

D
Adding of an acid to water, which results in the formation of bubbles of gas.
Question 14
1 / -0

Which of the following colloidal systems contains solid in the dispersed phase?

A
Starch

B
Milk

C
Butter

D
Ice cream
Question 15
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Which of the following statements about mixtures is not true?

A
The components of a mixture do not react with each other.

B
Each component of a mixture retains its characteristic properties.

C
A mixture can be separated into its constituents by physical means.

D
The components of mixtures combine physically in a definite proportion.

Solution

The composition of a mixture is not fixed.
Hence, statement (4) is incorrect.
Question 16
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Which of the following statements is true about mixtures?

A
A simple mixture involves the combination of solids only.

B
A simple mixture involves the combination of liquids only.

C
A simple mixture involves the combination of gases only.

D
A simple mixture may involve various combinations of solids, liquids and gases.

Solution

Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties.
Question 17
1 / -0

Which of the following statements is correct about homogeneous and heterogeneous mixtures?

A
Heterogeneous mixtures are mixtures that have a definite composition.

B
Salad is a typical example of a heterogeneous mixture.

C
Homogeneous mixtures are mixtures that have a definite composition.

D
A homogeneous mixture can contain more than one phase.

Solution

Salad is a typical example of a heterogeneous mixture.

The other statements are incorrect as all mixtures (homogeneous or heterogeneous) have a variable composition.
All the components in a homogeneous mixture are in the same phase.
Question 18
1 / -0

We have a mixture of four liquids a, b, c and d with boiling points 50^oC, 70^oC, 80^oC and 100^oC respectively. Which liquid will separate out first during fractional distillation?

A
a

B
b

C
c

D
d
Question 19
1 / -0

During the separation of dissolved solids by chromatography, which of the following properties of solids is used?

A
Melting point

B
Boiling point

C
Solubility

D
Hardness

Solution

Chromatography is the technique used for separation of those solutes that dissolve in the same solvent. The separation of dissolved solids by chromatography is based on solubility of the substance.
Question 20
1 / -0

If a maximum of 32 grams of potassium nitrate can be dissolved in 100 grams of water at 20^oC, then the solubility of potassium nitrate in water at 20^oC will be

A
320 grams

B
3.2 grams

C
32 milligrams

D
32 grams

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Solution, Mixtures And Separation Methods Test - 6

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Solution, Mixtures And Separation Methods Test - 6

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Question 1

Filter paper

Ordinary paper

Chromatography paper

Micro filter paper

Solution

Question 2

sublimation

evaporation

distillation

crystallisation

Solution

Question 3

filtration using a filter paper

distillation

fractional distillation

centrifugation

Question 4

Evaporation

Centrifugation

Distillation

Chromatography

Solution

Question 5

Common salt

Sulphur

Iron filings

Camphor

Solution

Question 6

Curd formation

Formation of clouds

Growth of a plant

Dissolving common salt in water

Question 7

Solid foam

Emulsion

Solid sol

Sol

Question 8

Shaving cream

Butter

Fog

Soap solution

Question 9

a solid or liquid, a gas

a gas, a solid medium

a gas, a liquid medium

liquid, another liquid

Question 10

Milk

Shaving cream

Gelatin

Soap bubbles

Question 11

Vinegar

Blood

Ink

Smoke

Question 12

During a chemical change the reactants form products of equal mass.

The physical changes can not be reversed.

The chemical changes can be reversed.

In physical changes a new substance is formed and energy is either liberted or absorbed.

Question 13

Heating of water to its boiling point.

Formation of liquid water by cooling of water vapour or by heating of ice.

Cooling of water to its freezing point.

Adding of an acid to water, which results in the formation of bubbles of gas.

Question 14

Starch

Milk