Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

Name the process used for the separation of colours in dye.

A
Distillation

B
Centrifugation

C
Chromatography

D
Decantation

E
All of the above can be used.

Solution

Chromatography is the technique used for the separation of those solutes
that dissolve in the same solvent. It is the technique used for the separation of colours in a dye. Usually, a dye is a mixture of two or more colours. A dye is soluble in water, but the individual components of a dye may have different solubilities in water. The coloured component that is more soluble in water, rises faster on the filter paper, used for chromatography, and in this way, the colours get separated.
Question 2
1 / -0

Size of colloidal particles is

A
0.1 $$ \mu m$$ to 0.001 $$ \mu m $$

B
10 $$\mu m $$ to 20 $$\mu m $$

C
0.05 $$ \mu m $$ to 0.1 $$ \mu m $$

D
25 $$\mu m$$ to 30 $$\mu m $$

Solution

The size of colloidal particles is of the order $$0.1\ \mu m $$ to $$0.001 \mu m$$.
Question 3
1 / -0

The solvent which neither accepts nor donates proton is called________

A
Amphoteric

B
Neutral

C
Aprotic

D
Amphiprotic

Solution

Aprotic solvents: Solvents which neither donate nor accept protons, e.g., benzene, carbon tetrachloride
Question 4
1 / -0

Suspensions are

A
visible to naked eye

B
invisible through microscope

C
not visible by any means

D
invisible under electron microscope

Solution

Suspensions are homogeneous mixtures with particles that have diameters greater than 1000 nm. The size of the particles is great enough so they are visible to the naked eye. Blood and aerosol sprays are examples of suspensions.
Question 5
1 / -0

It is possible to obtain oxygen from air by fractional distillation because

A
Oxygen is in a different group of the periodic table from Nitrogen

B
Oxygen is more reactive than Nitrogen

C
Oxygen has higher b.p than Nitrogen

D
Oxygen has lower density than Nitrogen

Solution

It is possible to obtain oxygen from air by fractional distillation because Oxygen has higher b.p than Nitrogen.
Hence, Option "C" is the correct answer.
Question 6
1 / -0

Which is not colloid?

A
Chlorophyll

B
Egg

C
Ruby glass

D
Milk

Solution

Egg is a colloid of solid and liquid; Ruby glass is a colloid of solid and solid.

Milk is a colloid of liquid and liquid but chlorophyll is a complex of magnesium.
Question 7
1 / -0

The volume of a colloidal particle, $$ V_{C} $$ as compared to the volume of a solute particle in a true solution $$ V_{S} $$ could be:

A
$$ \dfrac{V_{C}}{V_{S}}\simeq 1 $$

B
$$ \dfrac{V_{C}}{V_{S}}\simeq 10^{23} $$

C
$$ \dfrac{V_{C}}{V_{S}}\simeq 10^{-3} $$

D
$$ \dfrac{V_{C}}{V_{S}}\simeq 10^{3} $$

Solution

Colloidal solutions are intermediate between true solutions and suspensions.
The size of the colloidal particles range from 1 to 1000 nm

$$\dfrac{V_{c}}{V_{s}} \approx 10^{3}$$
Question 8
1 / -0

Size of colloidal particle is:

A
$$\mathrm {1 \ to\ 10}\ \overset{o}{A} $$

B
$$\mathrm { 0.20\ to\ 0.50} \ \overset{o}{A} $$

C
$$\mathrm {10\ to\ 1000}\ \overset{o}{A} $$

D
$$ \mathrm {0.01\ to\ 0.1 }\ \overset{o}{A} $$

Solution

The colloidal particle size is mostly in the range of $$ 10\ \overset{o}{A}-1000\ \overset{o}{A} $$.

Option $$C$$ is correct.
Question 9
1 / -0

An examples of homogenous mixture is:

A
Mixture of milk and sugar

B
Mixture of sand and iron

C
Mixture of soil and water

D
Mixture of oil and water

Solution

A mixture of milk and sugar is a homogeneous mixture.
A homogeneous mixture is a mixture in which the composition is unique throughout the mixture. As sugar is uniformly distributed all over the mixture hence it is a homogeneous mixture.
All other mixtures are heterogeneous mixtures.
Hence, option $$A$$ is the correct answer.
Question 10
1 / -0

Which of the following is a heterogenous mixture ?

A
sugar solution

B
aqueous solution of salt

C
sand dissolved in water

D
soda water

Solution

Homogeneous mixture: A mixture having a uniform composition throughout its mass is known as a homogeneous mixture. It does not contain physically distinct parts. These mixtures form solutions.
Heterogeneous mixture: A mixture having non-uniform composition is known as a heterogeneous mixture. It contains physically distinct parts. These mixtures form colloids or suspension.
So, sand dissolved in water will form a heterogeneous mixture.
Hence, option C is correct.

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Is Matter Around Us Pure Test - 76

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Is Matter Around Us Pure Test - 76

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SHARING IS CARING

Question 1

Distillation

Centrifugation

Chromatography

Decantation

All of the above can be used.

Solution

Question 2

0.1 $$ \mu m$$ to 0.001 $$ \mu m $$

10 $$\mu m $$ to 20 $$\mu m $$

0.05 $$ \mu m $$ to 0.1 $$ \mu m $$

25 $$\mu m$$ to 30 $$\mu m $$

Solution

Question 3

Amphoteric

Neutral

Aprotic

Amphiprotic

Solution

Question 4

visible to naked eye

invisible through microscope

not visible by any means

invisible under electron microscope

Solution

Question 5

Oxygen is in a different group of the periodic table from Nitrogen

Oxygen is more reactive than Nitrogen

Oxygen has higher b.p than Nitrogen

Oxygen has lower density than Nitrogen

Solution

Question 6

Chlorophyll

Egg

Ruby glass

Milk

Solution

Question 7

$$ \dfrac{V_{C}}{V_{S}}\simeq 1 $$

$$ \dfrac{V_{C}}{V_{S}}\simeq 10^{23} $$

$$ \dfrac{V_{C}}{V_{S}}\simeq 10^{-3} $$

$$ \dfrac{V_{C}}{V_{S}}\simeq 10^{3} $$

Solution

Question 8

$$\mathrm {1 \ to\ 10}\ \overset{o}{A} $$

$$\mathrm { 0.20\ to\ 0.50} \ \overset{o}{A} $$

$$\mathrm {10\ to\ 1000}\ \overset{o}{A} $$

$$ \mathrm {0.01\ to\ 0.1 }\ \overset{o}{A} $$

Solution

Question 9

Mixture of milk and sugar

Mixture of sand and iron

Mixture of soil and water

Mixture of oil and water

Solution

Question 10

sugar solution

aqueous solution of salt

sand dissolved in water

soda water

Solution

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