General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

In which of the following minerals, aluminium is not present?

A
Cryolite

B
Mica

C
Feldspar

D
Fluorspar

Solution

Cryolite is $$Na_3AlF_6$$.

Mica is $$KAl_3Si_3O_{10}(OH)_2$$

Feldspars is $$KAlSi_3O_8 - NaAlSi_3O_8 - CaAl_2Si_2O_8$$.

Fluorspar is $$CaF_2$$.

$$Al$$ is not present in fluorspar.

Hence option $$D$$ is correct.
Question 2
1 / -0

In the electrolytic reduction of alumina, the electrolyte is covered with coke powder because, it __________.

A
prevents oxidation of aluminium formed

B
reacts with aluminium forming aluminium carbide

C
prevents heat loss from the electrolyte

D
none of the above

Solution

The electrolytic mixture is sprinkled with coke to prevent the anode's oxidation by the oxygen evolved
Also, more material to the top of the anode is continuously added in the form of briquettes made from coke and pitch. The lost heat from the smelting operation is used to bake the briquettes into the carbon form required for reaction with alumina.
Therefore, $$C$$ is correct
Question 3
1 / -0

The order of processes involved in the dressing of an ore are :
(i) grinding and crushing (ii) hand picking (iii) pulverization

A
(i), (ii), (iii)

B
(i), (iii), (ii)

C
(ii), (iii), (i)

D
(ii), (i), (iii)

Solution

Dressing of ore can be carried out by first handpicking followed by crushing and grinding and then pulverization.

Hence, the correct option is $$(D)$$
Question 4
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Which one of the following ore is not concentrated by froth floatation process?

A
Copper pyrites

B
Galena

C
Pyrolusite

D
Zinc blende

Solution

Generally, sulphide ores are concentrated by "Froth floatation" and apart from pyrolusite ($$MnO_2$$), all are sulphide ores. So, pyrolusite is not concentrated by froth floatation process.
Question 5
1 / -0

Which of the following statements is incorrect?

A
Calamine and Siderite are carbonates.

B
Argentite and Cuprite are oxides.

C
Zinc blende and Pyrites are sulphides.

D
Malachite and Azurite are ores of copper.

Solution

$$Calamine = ZnCO_3, Siderite=FeCO_3$$

$$Argentite=Ag_2S$$ and $$Cuprite=Cu_2O$$

$$Zinc blende =ZnS, Pyrites = FeS_2$$

$$Malachite=CuCO_3(Cu(OH)_2), Azurite=2CuCO_3Cu(OH)_2$$

Here Argentite is not an oxide.

Option B is correct.
Question 6
1 / -0

Zone refining is a method to obtain:

A
very high temperature

B
ultra pure $$Al$$

C
ultra pure metals

D
ultra pure oxides

Solution

Zone refining is based upon fractional crystallization as the impurity prefers to stay in the melt and on solidification only pure metals solidifies on the surface of melt.
In this process solubility of the impurities in the metal in molten and solid states is different.
This process is known as ultra-purification because it results in impurity level decreasing to ppm level.
Question 7
1 / -0

Which of the following element is found in its native state?

A
Silver

B
Gold

C
Sodium

D
Both (A) and (B)

Solution

Silver and Gold occur in native state (free state).

These elements have very low reactivity and are not attacked by oxygen or air, moisture, carbon dioxide or other non metals.
Question 8
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Which type of ores are concentrated by froth flotation process?

A
Carbonates

B
Sulphides

C
Oxides

D
Phosphates

Solution

The froth flotation method is used to separate and concentrate ores by altering their surfaces to a hydrophobic or hydrophilic condition.

This method is based on the principle of the difference in the wetting properties of the ore and the gangue particles with the water and oil.

Therefore, sulphide ores preferably wetted by the oil and the gangue with the water.
Hence, option $$(B)$$ is correct.
Question 9
1 / -0

Which ore is concentrated by froth flotation method?

A
Horn silver

B
Bauxite

C
Cinnabar

D
Haemattie

Solution

Generally sulphide ores are concentrated by "Froth floatation" and cinnabar(HgS) is a sulphide ore.
Question 10
1 / -0

The oil used in the froth flotation method for the purification of ore is:

A
coconut oil

B
olive oil

C
pine oil

D
castor oil

Solution

In froth floatation method, pine oil is used for the purification of ore.

Pine oil is added in the froth flotation method to create froath or bubble so that metal can be purify easily because pine oil prevents the ore from gangue for furthur mixing.

Option C is correct.

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General Principles and Processes of Isolation of Elements Test - 22

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General Principles and Processes of Isolation of Elements Test - 22

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Question 1

Cryolite

Mica

Feldspar

Fluorspar

Solution

Question 2

prevents oxidation of aluminium formed

reacts with aluminium forming aluminium carbide

prevents heat loss from the electrolyte

none of the above

Solution

Question 3

(i), (ii), (iii)

(i), (iii), (ii)

(ii), (iii), (i)

(ii), (i), (iii)

Solution

Question 4

Copper pyrites

Galena

Pyrolusite

Zinc blende

Solution

Question 5

Calamine and Siderite are carbonates.

Argentite and Cuprite are oxides.

Zinc blende and Pyrites are sulphides.

Malachite and Azurite are ores of copper.

Solution

Question 6

very high temperature

ultra pure $$Al$$

ultra pure metals

ultra pure oxides

Solution

Question 7

Silver

Gold

Sodium

Both (A) and (B)

Solution

Question 8

Carbonates

Sulphides

Oxides

Phosphates

Solution

Question 9

Horn silver

Bauxite

Cinnabar

Haemattie

Solution

Question 10

coconut oil

olive oil

pine oil

castor oil

Solution

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