General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 31

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Question 1
1 / -0

Silk moth feed on:

A
eucalyptus leaf

B
grapes Leaves

C
mulberry Leaves

D
neem leaves

Solution

Mulberry leaves are food for silk worms which produce silk.
Question 2
1 / -0

Sulfide ores are usually dressed by the _____ process.

A
sieve process

B
froth floatation

C
magnetic floatation

D
none of these

Solution

Froth floatation process is based on the principle that the metallic sulphide particles of ore are preferentially wetted by oil and the gangue particles by water.
Sulphide ores being lighter are easily wetted by oil to come on the surface of solution with froths during froth floatation process, leaving behind heavy matter of gangue wetted by water.
Sulphide ores are usually dressed by froth floatation process.
Question 3
1 / -0

Which of the following chemical reaction correctly shows Aqua-regia dissolving in gold?

A
$$Au+2[Cl]\longrightarrow AuCl_2\overset{HCl}{\longrightarrow} H_2[AuCl_4]$$

B
$$Ag+3[Cl]\longrightarrow AgCl_3\overset{HCl}{\longrightarrow} H[AgCl_4]$$

C
$$Au+3[Cl]\longrightarrow AuCl_3\overset{HCl}{\longrightarrow} H[AuCl_4]$$

D
$$Ag+2[Cl]\longrightarrow AgCl_2\overset{HCl}{\longrightarrow} H_2[AgCl_4]$$

Solution

Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid. It can dissolve the noble metals gold and platinum.
$$Au+3[Cl]\longrightarrow AuCl_3\overset{HCl}{\longrightarrow} H[AuCl_4]$$
Question 4
1 / -0

During concentration of _____ ores by froth floatation process potassium ethyl xanthate is added.

A
sulphide

B
carbonate

C
halide

D
amide

Solution

During concentration of sulphide ores by froth floatation process potassium ethyl xanthate is added.
Ethyl xanthate, potassium ethyl xanthate and similar compounds compounds behaves as collector and attaches themselves by polar groups to ore particles making that hydrophobic and i.e., why ore particles are passed into froth.
Question 5
1 / -0

The oil used in the froth floatation method for the purification of ore is _________.

A
Coconut oil

B
Olive oil

C
Pine oil

D
Castor oil

Solution

Froth Floatation process is suitable for sulphide ores. The process is based on different wetting characteristics of the ore and gangue particles with water and pine oil.

The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as a collector) and come at the surface along with the froth. Froth stabiliser (cresols, aniline) stabilise the froth.

So, the correct option is $$C$$
Question 6
1 / -0

Which oil is used as frother in froth floatation process?

A
Mustard oil

B
Coconut oil

C
Olive oil

D
Pine oil

Solution

Pine oil enhances non-wettability of the mineral particles. So, it is used as frothier in froth-flotation process.
Question 7
1 / -0

The diagram shows the sketch of an electrolytic cell used in the extraction of aluminium. At which electrode (A or B) is the aluminium formed?

A
A (Cathode)

B
B (Anode)

C
At both A and B

D
Cannot be determined

Solution

Aluminium ions receive electrons at the negative electrode(Cathode) and are reduced to aluminium atoms:

$$Al^{3+} + 3e^– \rightarrow Al$$ (reduction – gain electrons)

The molten aluminium sinks to the bottom of the cell, where it is tapped off.
Question 8
1 / -0

The diagram shows the sketch of an electrolytic cell used in the extraction of aluminium. What are the two aluminium compounds present in the electrolyte C?

A
Pure alumina (Al$$_2$$O$$_3$$) and cryolite (Na$$_3$$AlF$$_6$$)

B
Duralumin, magnalium

C
Cryolite, duralumin

D
none of the above

Solution

The two aluminium compounds present in the electrolyte C are:

1. Pure Alumina (aluminium oxide) Al₂O₃ and
2. Cryolite (sodium aluminium fluoride) Na₃AlF.
Hence, option A is correct.
Question 9
1 / -0

The substance added in water in the froth floatation process is

A
Olive oil

B
Pine oil

C
Coconut oil

D
None of the above

Solution

Froth floatation process: This process is best suitable for sulphide ores. It is based on different wetting characteristics of the ore and gangue particles with water and pine oil. The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as collector) and come at the surface along with the froth. Froth stabiliser (cresols, aniline) stabilises the froth.
Question 10
1 / -0

Silicon is the main constituent of _______.

A
alloys

B
rocks

C
animals

D
vegetables

Solution

Silicon is the most abundant element in the earth crust. It is found in rocks .

Therefore, the correct answer is $$B$$

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General Principles and Processes of Isolation of Elements Test - 31

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General Principles and Processes of Isolation of Elements Test - 31

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SHARING IS CARING

Question 1

eucalyptus leaf

grapes Leaves

mulberry Leaves

neem leaves

Solution

Question 2

sieve process

froth floatation

magnetic floatation

none of these

Solution

Question 3

$$Au+2[Cl]\longrightarrow AuCl_2\overset{HCl}{\longrightarrow} H_2[AuCl_4]$$

$$Ag+3[Cl]\longrightarrow AgCl_3\overset{HCl}{\longrightarrow} H[AgCl_4]$$

$$Au+3[Cl]\longrightarrow AuCl_3\overset{HCl}{\longrightarrow} H[AuCl_4]$$

$$Ag+2[Cl]\longrightarrow AgCl_2\overset{HCl}{\longrightarrow} H_2[AgCl_4]$$

Solution

Question 4

sulphide

carbonate

halide

amide

Solution

Question 5

Coconut oil

Olive oil

Pine oil

Castor oil

Solution

Question 6

Mustard oil

Coconut oil

Olive oil

Pine oil

Solution

Question 7

A (Cathode)

B (Anode)

At both A and B

Cannot be determined

Solution

Question 8

Pure alumina (Al$$_2$$O$$_3$$) and cryolite (Na$$_3$$AlF$$_6$$)

Duralumin, magnalium

Cryolite, duralumin

none of the above

Solution

Question 9

Olive oil

Pine oil

Coconut oil

None of the above

Solution

Question 10

alloys

rocks

animals

vegetables

Solution

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