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Types of mixtures - class-IX

Description: types of mixtures
Number of Questions: 15
Created by:
Tags: structure of matter chemistry separation of substances matter around us is matter around us pure elements, compounds and mixtures
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The constituents of the mixture are easily seen with naked eyes. Then the mixture is ____________.

  1. Homogenous

  2. Heterogenous

  3. Both (a) and (b)

  4. None of these


Correct Option: B
Explanation:

The homogenous mixture consists of different components which are uniformly distributed in the solution and it can't be seen with naked eyes.

The heterogeneous mixture consists of two or more parts which have different compositions. These have visible boundaries of separation between the different constituents and can be easily seen even with naked eyes.

When sunlight passes through the window of a classroom, its path is visible. This is due to ________ of light. 

  1. reflection

  2. scattering

  3. saturation

  4. absorption


Correct Option: B
Explanation:

Due to Tyndall effect, there occurs scattering of light and the path becomes visible. The dust particles scatter the beam of light.

Which of the following statement(s) is\are not correct?

  1. $\text{An element of a substance contains only one kind of atom}$

  2. $\text{A mixture is not always heterogeneous}$

  3. $\text{Elements can exist as atoms or molecules but compounds exist only as molecules}$

  4. $\text{Atoms of same element have always same atomic mass number}$


Correct Option: D
Explanation:

Atoms of the same element can have different mass numbers and they are known as isotopes.


For example,

Hydrogen have $3$ isotopes.
$H_1^1, \ D_1^2, \ T_1^3$


Hence, option $D$ is an incorrect statement.

The example of heterogeneous mixture is:

  1. Water and stone.

  2. Water and lemon juice.

  3. Water and alcohol.

  4. Water and sugar.


Correct Option: A
Explanation:

A heterogeneous mixture is simply any mixture that is not uniform in composition. Two immiscible liquids form heterogeneous mixtures.

In given examples, water & lemon juice, water & alcohol, water & sugar result in uniform composition forming homogeneous mixture.
$\therefore$ Water and stone is a heterogeneous mixture.

A mixture of $100mL$ of $CO,CO_2$ and $O_2$ was sparked. When the resulting gaseous mixture was passed through $KOH$ solution, concentration in volume decrease by $80mL$,. the composition of initla mixture may be (in the same order).
(a) $30mL,60mL,10mL$ (b) $30mL,50mL,20mL$ (c) $50mL,30mL,20mL$ (d) $20mL,70mL,10mL$

  1. a and c

  2. a and b

  3. b and d

  4. c and d


Correct Option: B

Molecules is the smallest particle of _______________

  1. compound

  2. substance

  3. mixture

  4. element


Correct Option: C

Two solid mixtures are :

  1. steel.

  2. solder.

  3. phosphor bronze.

  4. all of these.


Correct Option: D
Explanation:

All of them are alloys. Alloy is a material which is composed by mixing two or more metals or a metal and a non-metal. An alloy may be a solid solution of the elements (a single phase), a mixture of metallic phases (two or more solutions) or an intermetallic compound with no distinct boundary between the phases.
Examples of alloys are steel, solder, brass, pewter, phosphor bronze and an amalgam.

The separation of mixture depends on :

  1. boiling point

  2. solubility

  3. magnetic nature

  4. all of these


Correct Option: D
Explanation:

Separation of mixture basically depends on the physical and chemical properties of the components. These factors are state, melting and boiling point, solubility, magnetic nature etc.

A mixture refers to the physical combination of two or more substances on which the chemical identities are retained and are mixed in the form of solutions, suspensions, and colloids.

  1. True

  2. False


Correct Option: A

Soil is a homogeneous mixture.

Write true or flase.

  1. True

  2. False


Correct Option: B
Explanation:

Soil is a heterogeneous mixture.

 So,option-B is correct.

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

  1. a homogeneous solid in liquid mixture

  2. a heterogeneous liquid in liquid mixture

  3. a homogeneous liquid in liquid mixture

  4. none of these


Correct Option: C
Explanation:
Vinegar is homogenous solution because it is a completely uniform solution of liquid in liquid type of mixture (acetic acid in water)

The heterogeneous mixture of soot particles in air is a mixture of:

  1. solid-in-solid

  2. solid-in-gas

  3. gas-in-solid

  4. gas-in-gas


Correct Option: B

Unlike gases, can all liquids in liquid mixtures form solutions.

  1. True

  2. False


Correct Option: B
Explanation:

No, not all liquids in liquids mixture form solutions

we know that "like dissolve like", so, the liquids which have same polarity only form solutions.
for example: water and oil have different polarity and hence they do not form solution.

Match the column I with column II and select the correct option from the codes given :


Column I                       Column II

P. Chalk-water mixture     (i) A gaseous mixture
Q. Glucose solution          (ii) A solid-gas mixture
R. Fizzy drink                    (iii) A homogeneous solid-liquid mixture
S. Smoke                          (iv) A solid-liquid mixture
T. Air                                 (v) A gas-liquid mixture

  1. P-(iii), Q-(iv), R-(v), S-(i), T-(ii)

  2. P- (v), Q- (iii), R- (iv), S- (ii), T-(i)

  3. P-(ii), Q-(i), R-(iv), S- (v), T- (iii)

  4. P-( iv), Q- (iii), R- (v), S-(ii), T-(i)


Correct Option: D
Explanation:
Chalk-water mixture- A heterogeneous solid-liquid mixture

Glucose solution- A homogeneous solid-liquid mixture

Fizzy drink- A gas-liquid mixture

Smoke - A solid-gas mixture

Air - A gaseous mixture

Hence the correct option is D.

Which pair is a miscible liquid mixture?

  1. Ethylalcohol and water

  2. Mercury and alcohol

  3. Benzene and water

  4. Carbondisulphide and water


Correct Option: A
Explanation:
Water is polar and has hydrogen bonding. Since, ethyl alcohol has oxygen atom it also undergoes hydrogen bonding when mixed with water. Also, ethyl alcohol is polar due to high electro-negativity of $O$, due to which it mixes with water. Hence, ethyl alcohol and water are a pair of miscible liquid mixture. 
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