Is Matter Around Us Pure Test

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Is Matter Around Us Pure Test - 66

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Weekly Quiz Competition

Question 1
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Which of the following statement are false regarding colloidal solution?

P. Colloidal solutions are homogeneous in nature.

Q. Colloidal particles pass through an ordinary filter paper.

R. Colloidal particles can be seen with naked eyes.

S. Colloidal particles do not settle under gravity.

A
P and R

B
P and S

C
Q and R

D
R and S

Solution

Colloids are relatively stable in nature. The particles of the dispersed phase are in a state of continuous motion and remain suspended in the solution.
Colloids require specialized filters known as ultrafilters for filtration.
Colloidal solutions are heterogeneous in nature.
Colloidal particles do not settle under gravity and they can't be seen with naked eyes.

Hence, option $$A$$ selects the false statements about colloids.
Question 2
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The particles of a suspension will be of size ___.

A
Greater than 100 nm

B
Between 1 nm to 100 nm

C
Less than 1 nm

D
Less than 0.1 nm

Solution

The particles of a suspension are of a size greater than 100nm , hence option $$A$$ is correct
Question 3
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Identify the pure substance containing only one type of element.

A
Sugar

B
Diamond

C
Silica

D
Water

Solution

Here sugar $$(C_{12}H_{22}O_{11})$$ , silica $$(SiO_2)$$ and water $$(H_2O)$$ are compounds that contain more than one element.
Therefore, they are not pure substances.
While the diamond is an isotope of carbon only. Therefore diamond is a pure substance.

So, the correct answer is $$B$$.
Question 4
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A colloidal system is a two-phase system. Point out which of the following combination can not be considered a colloidal system?

A
solid-solid

B
liquid-liquid

C
gas-gas

D
liquid-gas

Solution

A solid-solid combination can be considered as a colloidal solution and the nature of the solution is solid sol. For example, colorful stone.

A liquid-liquid solution can be considered as a colloidal solution and the nature of the solution is an emulsion. Example, milk

A liquid-gas combination can be considered as a colloidal solution and the nature of the solution is aerosol. For example, cloud.

A gas-gas combination $$\text {can not be}$$ considered as a colloidal solution because this is homogeneous mixture and a colloidal solution is always a heterogeneous mixture.

Hence, option $$C$$ is correct.
Question 5
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Select the correct statements.

A
Lamp black in water is passed in colloid state on addition of gum

B
A white precipitate of $$BaSO_{4}$$ on washing continuously with water gives $$BaSO_{4}$$ solution

C
Electrodialysis is used to remove ionic impurities faster.

D
All are correct

Solution

A) All gums are soluble in water. When Lampblack in water is passed, gums in the water get hydrolyzed to yield a number of monosaccharides that are smaller in size. Thus, a colloidal sol is obtained. This is a correct statement.
B) Formation of a white precipitate of $$BaSO_{4}$$ that is insoluble in water but continuously washing with a large amount of water gives $$BaSO_{4}$$ solution. This is a correct statement.
C) Electrodialysis has been studied worldwide for the separative removal of various contaminants, such as nitrate, bromide, sodium, zinc, etc. This is also a correct statement.

Therefore all are correct statements.
Question 6
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Aqueous solution of a mixture contains $$LiCl, CuCl, NaCl$$ and $$AlCl_3$$. This is shaken with ether. What is/are left in water?

A
$$LiCl, NaCl$$

B
$$NaCl,$$ $$AlCl_3$$

C
Only $$CuCl$$

D
Only $$NaCl$$

Solution

1) $$LiCl$$ ,$$NaCl$$ are alkali halides.
2) Mostly aqueous solution of alkali halides are extracted when ethers are added.
so, in this case $$AlCl_3$$ and $$CuCl$$ will be eliminated.Thus, answer turns out to be $$LiCl$$ and $$NaCl$$.
Hence, option $$A$$ is correct.
Question 7
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A student was given a mixture of sulphur and iron fillings. He was told to heat the mixture and observe. What will be the colour of the compound formed?

A
Red

B
Black

C
Orange

D
Blue

Solution

When sulphur and iron filings are mixed and heated they form a compound $$FeS$$ (ferrous sulphide). $$FeS$$ is black in colour.

$$Fe+S\longrightarrow FeS$$ (Black coloured compound)

So, the correct option is (B)
Question 8
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A compound can be a mixture of:

A
atoms

B
molecules

C
ions

D
None of these

Solution

A compound consists of atoms of two or more different elements bound together.
So, option $$A$$ is correct.
Question 9
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Which of the following compounds do not exist?

A
$${{\text{B}}_{\text{2}}}{\text{C}}{{\text{l}}_{\text{4}}}{\text{,BC}}{{\text{l}}_{\text{2}}}{\text{,C}}{{\text{l}}_{\text{2}}}{\text{B}}$$

B
$${\text{GaC}}{{\text{l}}_{\text{3}}}{\text{,}}\,{\text{GaS}}\,$$

C
$$\text G \text a \text S \text e, \text G \text a_2 \text S_3$$

D
All of these

Solution

In $$B_2Cl_4, BCl_2$$ & $$Cl_2B$$, chlorine due to its large size can not fit in between boron atoms. So, these compounds do not exist.
Hence, option $$A$$ is correct.
Question 10
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Find out a separating technique to separate the following mixture and write a note on it.

A

Two miscible liquids with large difference in boilling points

B

Ammonium chaoride and salt

C

Two immiscible liquids

D

Components from dye

E
Components from milk

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Re-Attempt Weekly Quiz Competition

Is Matter Around Us Pure Test - 66

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Is Matter Around Us Pure Test - 66

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Question 1

P and R

P and S

Q and R

R and S

Solution

Question 2

Greater than 100 nm

Between 1 nm to 100 nm

Less than 1 nm

Less than 0.1 nm

Solution

Question 3

Sugar

Diamond

Silica

Water

Solution

Question 4

solid-solid

liquid-liquid

gas-gas

liquid-gas

Solution

Question 5

Lamp black in water is passed in colloid state on addition of gum

A white precipitate of $$BaSO_{4}$$ on washing continuously with water gives $$BaSO_{4}$$ solution

Electrodialysis is used to remove ionic impurities faster.

All are correct

Solution

Question 6

$$LiCl, NaCl$$

$$NaCl,$$ $$AlCl_3$$

Only $$CuCl$$

Only $$NaCl$$

Solution

Question 7

Red

Black

Orange

Blue

Solution

Question 8

atoms

molecules

ions

None of these

Solution

Question 9

$${{\text{B}}_{\text{2}}}{\text{C}}{{\text{l}}_{\text{4}}}{\text{,BC}}{{\text{l}}_{\text{2}}}{\text{,C}}{{\text{l}}_{\text{2}}}{\text{B}}$$

$${\text{GaC}}{{\text{l}}_{\text{3}}}{\text{,}}\,{\text{GaS}}\,$$

$$\text G \text a \text S \text e, \text G \text a_2 \text S_3$$

All of these

Solution

Question 10

Two miscible liquids with large difference in boilling points

Ammonium chaoride and salt

Two immiscible liquids

Components from dye

Components from milk

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