MCQ Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 12

Fractional distillation is used to separate liquids having an appreciable difference in their ______.

0%
size and shape
0%
solubility
0%
boiling points
0%
none of these

Explanation

Fractional distillation is a technique used to separate two miscible liquids having a difference of

$25^oC$ in their boiling points.
Option C is correct.

A heterogeneous mixture has a uniform composition throughout the mixture.

0%
True
0%
False

Matter that contains two or more constituent substances, combined in definite proportion is called______

0%
mixture
0%
compound
0%
element
0%
metalloid

Milk is an example of ______

0%
solution
0%
homogeneous mixture
0%
heterogeneous mixture
0%
suspension

Explanation

Milk is a heterogeneous mixture of tiny globules of fat and protein dispersed in water.

Hence, option

$\text{C}$ is the correct answer.

State whether the following statements are true or false.
The substance in which a solute dissolves is called a solvent.

0%
True
0%
False

Which is distilled first?

0%
Liquid $H_{2}$
0%
Liquid $CO_{2}$
0%
Liquid $O_{2}$
0%
Liquid $N_{2}$

Explanation

Since liquid hydrogen has least molecular mass among given substances, therefore it has weakest intermolecular interaction. Thus it has minimum boiling point and is distilled first.

Hence, the correct option is

$A$ .

The mixture of oil and water is :

0%
homogenous mixture
0%
heterogenous mixture
0%
pure mixture
0%
none of above

Which of the following is not a substance?

0%
Water
0%
Smoke
0%
Vision
0%
Dust

Air is:

0%
a pure substance
0%
a mixture
0%
a compound
0%
an element

Explanation

Air is a mixture of different elements (made of one type of atom, e.g. oxygen

$O_2$ , nitrogen

$N_2$ , etc.) and compounds (made of different atoms, e.g. water vapour

$H_2O$ ). It is not a pure substance because its constituents can be easily separated and its composition can vary.

A mixture consists of a soluble solid in a liquid. which method is most suitable for separating both the components?

0%
Sedimentation
0%
Winnowing
0%
Distillation
0%
Handpicking

Which among the following is a homogeneous system but is not a compound?

0%
Common salt
0%
Oil
0%
Milk
0%
Salt in water

Explanation

If it is not a chemical compound and then a homogeneous system must be a

$solution$ .
Common salt is a chemical compound.
Oil is also a compound.
Milk is a colloidal solution, a Heterogeneous mixture.

Salt in water is a true solution, which means it's a homogenous system but not a compound as it's a mixture.
Option

$D$

Which of the following is a heterogeneous mixture ?

0%
Air
0%
Rain
0%
Steel
0%
Soil

Which of the following is not heterogeneous?

0%
Jelly
0%
Milk
0%
Steel
0%
Smoke

Which of the following mixtures cannot be separated by using a separating funnel?

0%
Kerosene oil and water
0%
Ethyl alcohol and water
0%
Turpentine oil and water
0%
Benzene and water

Explanation

Ethyl alcohol and water are two miscible liquids. This mixture of ethyl alcohol and water can be separated by using the distillation method. Distillation is a process that can be used to separate a pure liquid from a mixture of liquids.

A separating funnel can be used to separate the components of the mixture of immiscible liquids. All other options are of immiscible liquids.

Option

$B$ is correct.

Four alternatives are given to each of the following incomplete statements questions.
Choose the right answer.
Which of the following is not a pure substance

0%
Common salt
0%
sugar
0%
Rain water
0%
Iron

Which of the following is the universal solvent?

0%
Water
0%
Petrol
0%
Benzene
0%
Alcohol

Which of the following method used to separate two immiscible liquids?

0%
Separation funnel
0%
Sieving
0%
Winnowing
0%
Sublimation

Explanation

Depending upon the properties of liquids, they can be separated by different methods. In general liquids, solutions are described in two ways, miscible and immiscible.

Immiscible liquids are separated by using a separating funnel. These liquids have a boundary between them or they are present one over the other due to differences in density. Liquid with high density stays at the bottom and can be separated out.

Sieving, winnowing and sublimation involves solids mixtures.

Hence, option

$A$ is correct.

Which method is commonly used to separate salt from water?

0%
Sedimentation
0%
Filteration
0%
Evaporation
0%
Condensation

True or False?
A mixture of milk and water can be separated by filtration.

0%
True
0%
False

Method for separating drugs (medicine) which are miscible in blood

0%
Distillation
0%
Sublimation
0%
Using separating funnel
0%
Chromatography

Which out of the following is not a homogeneous mixture?

0%
Air
0%
Brass
0%
Solution of sugar in water
0%
Smoke

Petrol is a homogeneous mixture of a number of hydrocarbons.

0%
True
0%
False

A mixture of water and acetone is being separated using the apparatus shown. Where will the separated acetone get collected?

0%
Q
0%
P
0%
S
0%
R

Which of the following is a true solution?

0%
Sugar solution
0%
Milk
0%
Blood
0%
Ink
0%
None of these

Explanation

Hint: True solution is a homogeneous mixture of two or more substances.

Explanation for correct $Option\,A$ :

• True solution is a homogenous mixture of two or more materials with a particle size of less than

$10$ -

$9$

$m$ or

$1nm$ dissolved in the solvent.

• Simple sugar solution in water is a true solution.

Explanation for incorrect $Options\,B\,,C\,,D\,and\,E$ :

• Milk is not a true solution, it is an

$emulsion$ .

• Blood is not a true solution, it is a

$colloidal$ solution

• Ink is not a true solution, it is a

$colloidal$ solution.

Hence, the correct answer is $Option\,A$

Study the given flowchart carefully and identify P and Q respectively.

0%
Compress and cool; Nitrogen
0%
Expand and heat; Argon
0%
Compress and heat; Oxygen
0%
Expand and cool; Oxygen

Explanation

Air is converted to liquid air when it is cooled that is kinetic energy decreases and is compressed when the number of molecules per unit volume increases.

$\, therefore, P$ is compressed and cool.

Liquid air is slowly warmed in the fractional distillation column and the vapors liquify as they move up.

Oxygen liquifies at $-183^{\circ} C$ , at flows out at the bottom. Nitrogen turns back into gas, at its boiling point is $-196^{\circ} \mathrm{C}$ . It flows through the pipe connected at top.

Option: $A$

Which kind of substance contain particles of only one kind ?

0%
Pure substance
0%
Impure substance
0%
Alloy
0%
Metalloid

Which of the following are properties of sols?

0%
Adsorption
0%
Tyndall effect
0%
Flocculation
0%
Paramagnetism

Ethyl alcohol is completely miscible with water. It can be separated from this mixture by:

0%
Using a separate funnel
0%
Evapouration
0%
Fractional distillation
0%
Allowing the water to evaporate

Liquids which do not mix with each other are :

0%
Solution
0%
Miscible
0%
Immiscible
0%
All of these
0%
None of these

If the ammonia gas is dissolved in the liquid which is going to be distilled, then after completion of distillation where it will be?

0%
Around the thermometer
0%
In the condenser
0%
In the distillate
0%
In the circulating water
0%
In the heated flask

Homogeneous mixtures are also called :

0%
colloids
0%
elements
0%
true solutions
0%
compound
0%
none of these

The disease kalaazar is cured by:

0%
colloidal antimony
0%
milk of magnesia
0%
argyrols
0%
colloidal gold
0%
colloidal silver

Chromatography is a word that means "colour writing". It is a technique that can be used to separate the components of a mixture.
In this experiment, a marker was used to make a dot of green ink on a piece of paper. The bottom edge of the paper was placed in water and the water travelled vertically up the paper. As a result, the spot of green ink was separated into two colors: blue and yellow.
Which of the following is the best explanation for the fact that the blue ink moved farther up the paper than the yellow ink in this experiment?

0%
The density of blue ink is greater than the density of yellow ink.
0%
Blue ink is more soluble in water than yellow ink is.
0%
Blue ink has a smaller molar mass than yellow ink.
0%
Molecules of blue ink are smaller in size than molecules of yellow ink.

Choose the correct answer form the alternatives given.
A student by chance mixed acetone with alcohol. This mixture of acetone and alcohol can be separated by

0%
Filtration
0%
Separating funnel
0%
Fractional crystallisation
0%
Fractional distillation

The copper sulphate solution during crystallization is filtered to:

0%
separate copper
0%
form crystals
0%
separate impurities
0%
All of the above

Explanation

If the hot solution of copper sulphate contains insoluble impurities, it can be removed by the process of filtration.

For this process, a filter paper is placed cone in a funnel and wet the filter paper with a spray of water is fixed inside the funnel properly to separate impurities.

Option

$C$ is correct.

The colloidal solutions of gold prepared by different methods have different colours. This is due to:

0%
Difference in size of colloidal particles
0%
Different concentration of gold
0%
Presence of different types of foreign particles
0%
The variable valency of gold

What do you call a mixture where two substances are mixed in uniform composition?

0%
Aerosol
0%
Colloid
0%
Suspension
0%
None of the above

The suitable method is to separate the following components of the mixtures.

A) Two volatile liquids with appreciable differences in boiling points.

B) Two or more colored constituents soluble in some solvent.

0%
A - Fractional distillation, B - decantation
0%
A - Simple distillation, B - Evaporation
0%
A - Simple distillation, B - Chromatography
0%
A - Sublimation, B - Chromatography
0%
A - Sublimation, B - Simple distillation

Explanation

A) Two volatile liquids with an appreciable difference in boiling point are separated by a

$\text{simple distillation}$ method. In this method, the liquid with a low boiling point is evaporated first. After condensation is collected in another vessel and by this way get separated from another liquid.

B) Two or more colored constituents are separated by the

$\text{chromatography}$ method. In this method, the liquid which is more soluble in solvent moves faster and hence gets separated.

Hence, option

$C$ is correct.

Which of the following is made up of atoms of two different elements?

0%
Ozone
0%
Water
0%
Glucose
0%
Sulphuric acid

Explanation

Ozone has the chemical formula

$O_3$ , that is made up of atoms of the same element (oxygen).

Water is made up of atoms of O and H and has the formula

$H_2O$ .

Glucose has the formula

$C_6H_{12}O_6$ , which means it made up of atoms of C, H and O.

Finally, sulphuric acid is made up of atoms of H, S and O and has the formula

$H_2SO_4$ .

So, the correct option is B.

If a chemical is given to you, how would you know that it is pure?

0%
By checking its melting point
0%
By observing its colour
0%
By testing
0%
By smelling it

Petrol and water can be separated by ............ because................

0%
fractional distillation, they are immiscible liquids
0%
simple distillation, their boiling points slightly differ.
0%
separating funnel, they are immiscible liquids.
0%
None of these

Homogeneous mixture is formed by mixing:

0%
acetone and water
0%
iron filing and water
0%
silver chloride and water
0%
ethanol and water

Smoke is an example of

0%
gas dispersed in liquid.
0%
gas dispersed in solid.
0%
solid dispersed in gas.
0%
solid dispersed in liquid.

Mixture of

$MgCO_{3}$ &

$NaHCO_{3}$ on strong heating gives

$CO_{2}$ &

$H_{2}O$ in

$3 : 1$ mole ratio. The weight

$\%$ of

$NaHCO_{3}$ present in the mixture is :

0%
$33.33\%$
0%
$66.66\%$
0%
$48.6\%$
0%
$50\%$

A mixture of mustard oil and water forms

0%
a Compound
0%
a Homogeneous mixture
0%
an Alloy
0%
a Heterogeneous mixture

The pH of a sample of

$H_{2}SO_{4}$ is 1.The percentage of the solution is

$73.5\%$ (W/W), the density of the solution is

0%
$2.66\times10^{-3} g/cc$
0%
$5.32\times10^{-3} g/cc$
0%
$1.33\times10^{-3} g/cc$
0%
$0.01 g/cc$

Potassium hydroxide solution is used to absorb

${ CO }_{ 2 }$ . How many litres of

${ CO }_{ 2 }$ at 1.00 atm and

${ 22 }^{ \circ }C$ would be absorbed by an aqueous solution containing 15.0 g of KOH?

$2KOH+{ CO }_{ 2 }\rightarrow { K }_{ 2 }{ CO }_{ 3 }+{ H }_{ 2 }O$

0%
3.24 L
0%
1.62 L
0%
6.48 L
0%
0.324 L

Choose the incorrect option

0%
$CHC{I_3}$ and $CC{I_4}$ can be separated by fractional distillation
0%
Acetone and benzene can be separated by fractional distillation
0%
Aniline is separated from a mixture of aniline and water by the method of steam distillation
0%
Glycerol cannot be separated from spent-lye in soap industries by distillation under reduce pressure.

Explanation

$A:$

$CHCl_3$ and

$CCl_4$ can be separated by fractional distillation-

$True$ .

$B:$

$Acetone$ and

$Benzene$ can be separated by fractional distillation -

$True$ .

$C:$

$Aniline$ is separated from a mixture of aniline and water by steam distillation -

$True$ .

$D:$

$Glycerol$ cannot be separated from spent-lye in soap industries by distillation under the reduced pressure. -

$False$ .

We know that glycerol is a high boiling point liquid. It is found that glycerol can be separated from spent-lye by the process of fractional distillation under reduced pressure.

Hence, option

$D$ is correct.

Which of the following will form negatively charged colloidal solution ?

0%
100 ml 0.1 M AgNO $_{3}$ + 100ml 0.1 M KI
0%
100 ml 0.2 M AgNO $_{3}$ + 100ml 0.1 MKI
0%
100ml 0.1 MAgNO $_{3}$ + 100ml 0.2 M KI
0%
100ml 0.2 M AgNO $_{3}$ + 200 ml 0.1 M KI

Egg albumin is :

0%
Reversible colloid
0%
Lyophilic colloid
0%
Protective colloid
0%
All

Explanation

Egg albumin is a type of reversible colloid, lyophilic colloid and as well as protective colloid.

Hence the correct option is

$D$ .

CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 12 - MCQExams.com

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Practice Class 9 Chemistry Quiz Questions and Answers

CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 12 - MCQExams.com

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Practice Class 9 Chemistry Quiz Questions and Answers

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