General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

The method used for the concentration of sulphide ores is:

A
froth floatation

B
smelting

C
magnetic separatio

D
gravity separation

Solution

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. The principle of froth flotation process is that sulphide ores are preferentially wetted by the pine oil, whereas the gangue particles are wetted by the water. Hence the method used for the concentration of sulphide ores is froth flotation.
Question 2
1 / -0

Cinnabar $$(HgS)$$ is heated in air, it is first converted into ________ which is then reduced to _______ on further heating.

A
$$HgO$$, $$Hg$$

B
$$HgO$$, $$Hg_2O$$

C
$$Hg_2O$$, $$Hg$$

D
$$Hg_2O$$, $$HgO$$

Solution

Cinnabar $$(HgS)$$ is heated in air, it is first converted into $$(HgO)$$ which is then reduced to Hg on further heating.
$$2HgS + 3O_2 \xrightarrow {\Delta } 2HgO + 2SO_2$$
$$2HgO \xrightarrow {\Delta} 2Hg + O_2$$
Question 3
1 / -0

During electrolytic refining of Alumina, the molten electrolyte used contains _______ .

A
Cryolite

B
Fluorspar

C
Pure alumina

D
All of the above

Solution

During electrolytic refining of Alumina, the molten electrolyte used contains pure alumina $$(Al_2O_3)$$. The electrolyte consists of alumina dissolved in fused Cryolite (Na$$_3$$AlF$$_6$$) and Fluorspar(CaF$$_2$$).

Hence, the correct option is $$D$$.
Question 4
1 / -0

During electrolytic reduction of alumina, ___________.

A
Al is formed at cathode and oxygen is formed at anode

B
Al is formed at anode and oxygen is formed at cathode

C
Al is formed at cathode and hydrogen is formed at anode

D
Al is formed at anode and hydrogen is formed at cathode

Solution

During electrolytic reduction of alumina, Al is formed at cathode and oxygen is formed at anode.
$$\circleddash$$ Cathode: $$Al^{3+} + 3e^- \longrightarrow Al$$
$$\oplus$$ Anode: $$2O^{2-} \longrightarrow O_2+4e^-$$
Question 5
1 / -0

Mercury has low boiling point. Therefore it can be purified by the process of:

A
liquation

B
polling

C
oxidation

D
distillation

Solution

Mercury has a low boiling point. Therefore it can be purified by the process of distillation because then mercury will evaporate and collected in pure form and impurities will remain back.
Question 6
1 / -0

During calcination:

A
carbonate ores are changed into oixdes

B
oxide ores are changed into carbonates

C
carbonate ores are changed into sulhides

D
oxide ores are changed into sulphides

Solution

During calcination, carbonate ores are changed into oxides by heating strongly in limited air.
$$ZnCO_3 \rightarrow ZnO + CO_2$$
Question 7
1 / -0

The process of zone refining is used in the purification of :

A
$$Al$$

B
$$Ge$$

C
$$Cu$$

D
$$Ag$$

Solution

Zone refining process is used in the purification of germanium.
Question 8
1 / -0

Metal oxide can be reduced by __________.

A
$$Fe$$

B
$$Sn$$

C
$$C$$

D
All of these

Solution

Metal oxide of the low reactivity can be reduced by carbon in the simple extraction process. For example; lead oxide is reduced by carbon and it extract lead from its ore.
$$2PbO(l) + C(s) \rightarrow 2Pb (s) + CO_2 (g)$$
Question 9
1 / -0

The ore that is concentrated by the froth floatation process is:

A
chalcopyrites

B
cryolite

C
cuprite

D
calamine

Solution

The ore that is concentrated by the froth flotation process is chalcopyrites. Chalcopyrites is copper pyrites ($$CuFeS_2$$) , zinc blende ($$ZnS$$) and chalcopyrites.
Question 10
1 / -0

Aluminium powder is used in thermite welding because :

A
it is a strong reducing agent

B
it is a strong oxidising agent

C
it is corrosion resistant

D
it is a good conductor of heat

Solution

The reduction of the metallic oxide with Al is known as the thermite process. Aluminium is used as a thermite mixture in thermite welding. Al powder is used as it is a strong reducing agent and it reduces $$Fe_{2}O_{3}$$ to iron. Reduced molten iron sinks and flows into the gap of the grinder thereby welding it.

$$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$$

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General Principles and Processes of Isolation of Elements Test - 36

Result

General Principles and Processes of Isolation of Elements Test - 36

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SHARING IS CARING

Question 1

froth floatation

smelting

magnetic separatio

gravity separation

Solution

Question 2

$$HgO$$, $$Hg$$

$$HgO$$, $$Hg_2O$$

$$Hg_2O$$, $$Hg$$

$$Hg_2O$$, $$HgO$$

Solution

Question 3

Cryolite

Fluorspar

Pure alumina

All of the above

Solution

Question 4

Al is formed at cathode and oxygen is formed at anode

Al is formed at anode and oxygen is formed at cathode

Al is formed at cathode and hydrogen is formed at anode

Al is formed at anode and hydrogen is formed at cathode

Solution

Question 5

liquation

polling

oxidation

distillation

Solution

Question 6

carbonate ores are changed into oixdes

oxide ores are changed into carbonates

carbonate ores are changed into sulhides

oxide ores are changed into sulphides

Solution

Question 7

$$Al$$

$$Ge$$

$$Cu$$

$$Ag$$

Solution

Question 8

$$Fe$$

$$Sn$$

$$C$$

All of these

Solution

Question 9

chalcopyrites

cryolite

cuprite

calamine

Solution

Question 10

it is a strong reducing agent

it is a strong oxidising agent

it is corrosion resistant

it is a good conductor of heat

Solution

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