General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

When a metal is to be extracted from its ore if the gangue associated with the ore is silica , then

A
An acidic flux is needed

B
A basic flux is needed

C
Both acidic and basic flux are needed

D
Neither of them is needed

Solution

$$\underset {Acidic\ impurity} {SiO_2} + \underset {Basic\ Flux} {CaO} \rightarrow \underset {Slag}{CaSiO_3}$$

Option B is correct.
Question 2
1 / -0

In Hall's process the main reagent is mixed with

A
$$NaF$$

B
$$Na_{3}AlF_{6}$$

C
$$AlF_{3}$$

D
None of these

Solution

Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about $$2000^{o}C$$ and at this temperature when the electrolysis is carried of fused mass the metal formed vapourises as the boiling point of $$Al$$ is $$1800^{o}C$$

To overcome this difficulty. $$Na_{3}AlF_{6}$$ and $$CaF_{2}$$ are mixed with alumina.
Question 3
1 / -0

Carbon reduction process is used for the extraction of

A
$$Hg$$

B
$$Zn$$

C
$$Cr$$

D
$$Fe$$

Solution

The oxides of less electropositive metals are reduced by strongly heating them with coal or coke. Carbon combines with the oxygen of the metal oxide to form carbon monoxide which can also act as a reducing agent.
$$Fe_2O_3 + 3C \rightarrow 3CO + 2Fe$$

Option D.
Question 4
1 / -0

Directions For Questions

Amongst the various ores of a metal (M) (sulphide, carbonates, oxides, hydroxides) two ores [X] and [Y] show the following reactivity.
(i) [X] on calcination gives a black solid (S) carbon dioxide and water.
(ii) [X] dissolved in dilute HCl, on reaction with KI gives a white precipitate (P) and iodine.
(iii) [Y] on roasting gives metal (M) and a gas (G) which turns acidified $$K_{2}Cr_{2}O_{7}$$ solution green.
(iv) [Y] on reaction with dil. HCl gives a white precipitate (Q) and another gas $$\left ( G_{2} \right )$$ which turns lead acetate solution black and also reacts with gas $$\left ( G_{1} \right )$$ to precipitate colloidal in presence of moisture.

...view full instructions

The white precipitate (P) is of :

A
$$Cu_{2}I_{2}$$

B
$$CuI_{2}$$

C
$$K_{2}\left [ CuI_{4} \right ]$$

D
None
Question 5
1 / -0

In the metallurgical extraction of zinc from $$ZnO$$, the reducing agent used is

A
Carbon monoxide

B
Sulphur dioxide

C
Carbon dioxide

D
Nitric oxide

Solution

$$ZnO + CO \rightarrow CO_2 + Zn$$

Carbon monoxide is used as a reducing agent in the extraction of carbon monoxide.

Option A.
Question 6
1 / -0

The substance used in the thermite process of reducing metal ores is

A
Aluminium

B
Thorium

C
Heated platinum gauze

D
Carbon

Solution

In thermite process a mixture of aluminium powder and ferric oxide in the rate of $$1 : 3$$ is used.

Option A.
Question 7
1 / -0

Thermite process is used to extract metals

A
when their oxides can't be reduced by carbon

B
when their carbonates do not yield oxides by thermal decomposition

C
when their sulphides can't be converted into oxides by roasting

D
when their melting points are very high

Solution

Thermite process is used to extract metals when their oxides can't be reduced by carbon.

Hence, Option "A" is the correct answer.
Question 8
1 / -0

Which one of the following metals is extracted by thermal reduction process ?

A
Copper

B
Iron

C
Aluminium

D
Magnesium

Solution

Copper, Aluminium and Magnesium are extracted through Electrochemical process. But, Iron is extracted through thermal reduction process.

Hence, Option "B" is the correct answer.
Question 9
1 / -0

The extraction of nickel involves

A
the formation of $$ Ni(CO)_4 $$

B
the decomposition of $$ Ni(CO)_4 $$

C
the formation and thermal decomposition of $$ Ni(CO)_4 $$

D
the formation and catalytic decomposition of $$ Ni(CO)_4 $$

Solution

The extraction of nickel involves the formation and thermal decomposition of $$ Ni(CO)_4 $$.

$$Ni+4CO\to Ni(CO)_4 (vap)\xrightarrow {\Delta} Ni(s)+4CO(g)$$
Question 10
1 / -0

Heating with carbon in absence of air is known as

A
Reduction

B
Carbon - reduction

C
Smelting

D
Roasting

Solution

Heating with carbon in absence of air is known as carbon reduction.
This is used in Iron metallurgy.
$$Fe_2O_3 + C \xrightarrow {in\, blast \,furnace}Fe$$

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General Principles and Processes of Isolation of Elements Test - 65

Result

General Principles and Processes of Isolation of Elements Test - 65

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SHARING IS CARING

Question 1

An acidic flux is needed

A basic flux is needed

Both acidic and basic flux are needed

Neither of them is needed

Solution

Question 2

$$NaF$$

$$Na_{3}AlF_{6}$$

$$AlF_{3}$$

None of these

Solution

Question 3

$$Hg$$

$$Zn$$

$$Cr$$

$$Fe$$

Solution

Question 4

$$Cu_{2}I_{2}$$

$$CuI_{2}$$

$$K_{2}\left [ CuI_{4} \right ]$$

None

Question 5

Carbon monoxide

Sulphur dioxide

Carbon dioxide

Nitric oxide

Solution

Question 6

Aluminium

Thorium

Heated platinum gauze

Carbon

Solution

Question 7

when their oxides can't be reduced by carbon

when their carbonates do not yield oxides by thermal decomposition

when their sulphides can't be converted into oxides by roasting

when their melting points are very high

Solution

Question 8

Copper

Iron

Aluminium

Magnesium

Solution

Question 9

the formation of $$ Ni(CO)_4 $$

the decomposition of $$ Ni(CO)_4 $$

the formation and thermal decomposition of $$ Ni(CO)_4 $$

the formation and catalytic decomposition of $$ Ni(CO)_4 $$

Solution

Question 10

Reduction

Carbon - reduction

Smelting

Roasting

Solution

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