Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 68

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Weekly Quiz Competition

Question 1
1 / -0

How will you separate a solution (miscible) of benzene and chloroform.

A
Fractional distillation

B
Sublimation

C
Filtration

D
Crystallisation

Solution

fractional distillation because the boiling point of benzene $$(80^oC)$$ and chloroform $$(61.5^oC)$$ are close. Fractional distillation involves repeated distillations and condensations, in a fractionating column. The basic principle of this distillation is that different liquid boils and evaporates at different temperatures. So, it can separate miscible liquids.
Option $$A$$ is correct.
Question 2
1 / -0

Which is a natural colloid?

A
Sodium chloride

B
Urea

C
Cane sugar

D
Blood

Solution

$$\text{Blood}$$ is a natural colloid.
Sodium chloride, cane sugar, and urea can get dissolved completely in water and forms a homogeneous solution.
Option $$D$$ is correct.
Question 3
1 / -0

The colloidal solution of gelatin is known

A
Solvent loving sol

B
Reversible sol

C
Hydrophilic colloids

D
All of these

Solution

Gelatin, can behave both as a sol and a gel. At high temperature and low concentration of gelatin, the colloid is a hydrosol, but at low temperature and high gelatin concentration, the hydrosol can change into a gel which is solvent loving and hydrophilic.
Question 4
1 / -0

A mixture of water and NaCl can be separated by:

A
sublimation

B
evaporation

C
decantation

D
filtration

Solution

There is a difference in the boiling point of water and $$NaCl$$(salt). The boiling point of water is less than salt. On heating the mixture of water and $$NaCl$$, water evaporates leaving behind salt$$(NaCl)$$, so evaporation can be used to remove the water to obtain salt.
Question 5
1 / -0

Jelly is a form of

A
suspension

B
colloidal solution

C
supersaturated solution

D
true solution

Solution

Jelly is a colloidal solution of sweetened fruit, water and a thickener called pectin. In it, the dispersed phase is liquid (water or sugar syrup) and the dispersing medium is solid (bits of sweetened fruit pulp). It belongs to the category of 'gel' type of colloid.
Question 6
1 / -0

In laboratory, solvent can be separated from solute by the process.

A
Decantation

B
Sedimentation

C
Distillation

D
Filtration

Solution

Both a solute and a solvent are components of a solution which is a homogenous mixture. Many solutions in chemistry are aqueous solutions.
Since the solution is a physical mixture, separation involves using a physical process such as evaporation or distillation. The water can be evaporated leaving the dry solute behind and then the water can be condensed.
Option C is correct.
Question 7
1 / -0

Which one of the following is not represented by sols

A
Absorption

B
Tyndall effect

C
Flocculation

D
Paramagnetism

Solution

Absorption, Tyndall effect and flocculation all are related to sol but paramagnetism is not represented by sol.
Question 8
1 / -0

Which one of the following is a hydrophilic colloidal sol

A
Barium hydroxide solution

B
Arsenic sulphide solution

C
Starch solution

D
Silver chloride solution

Solution

Starch is an example of a hydrophilic colloidal sol. It has strong affinity between disperse phase and dispersion medium. It is a reversible and stable sol.
Question 9
1 / -0

Sulphur sol contains

A
Discrete sulphur atoms

B
Discrete sulphur molecules

C
Large aggregates of sulphur molecules

D
Water dispersed in solid sulphur

Solution

Sulphur sol contains an aggregate of thousands of $$ S_8 $$ sulphur molecules.

If large number of atoms or smaller molecules of a substance aggregate together to form particles having size in the colloidal range then the colloidal system is known as multimolecular colloid.
Question 10
1 / -0

Which one of the sols acts as protective colloid

A
$$ As_{2}S_{3} $$

B
Gelatin

C
Au

D
$$ Fe(OH)_{3} $$

Solution

Gelatin with lowest gold number, act as best protective colloid.

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 68

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Is Matter Around Us Pure Test - 68

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Question 1

Fractional distillation

Sublimation

Filtration

Crystallisation

Solution

Question 2

Sodium chloride

Urea

Cane sugar

Blood

Solution

Question 3

Solvent loving sol

Reversible sol

Hydrophilic colloids

All of these

Solution

Question 4

sublimation

evaporation

decantation

filtration

Solution

Question 5

suspension

colloidal solution

supersaturated solution

true solution

Solution

Question 6

Decantation

Sedimentation

Distillation

Filtration

Solution

Question 7

Absorption

Tyndall effect

Flocculation

Paramagnetism

Solution

Question 8

Barium hydroxide solution

Arsenic sulphide solution

Starch solution

Silver chloride solution

Solution

Question 9

Discrete sulphur atoms

Discrete sulphur molecules

Large aggregates of sulphur molecules

Water dispersed in solid sulphur

Solution

Question 10

$$ As_{2}S_{3} $$

Gelatin

Au

$$ Fe(OH)_{3} $$

Solution

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