General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 21

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Question 1
1 / -0

The thickness of cathode increases in :

A
electrorefining of copper

B
electroplating of copper

C
anodizing of copper

D
none of the above

Solution

In electrolysis of copper, pure copper gets deposited on cathode while impure copper goes to anode. So, the cathode increases in thickness.
Question 2
1 / -0

Anodic product in the electrolytic reduction of alumina is:

A
$$CO_{2}, \ \ O_{2}$$

B
$$O_{2}$$

C
$$F_{2}$$

D
$$O_{2},\ \ 4F_{2}$$

Solution

Alumina is $$Al_2O_3$$.

Ionisation of alumina: $$Al_2O_3 \rightarrow 6O_2^-+4Al^{3+}$$.

Reaction at cathode: $$4Al^{3+}+12e^- \rightarrow 4Al$$.

Reaction at anode: $$6O_2^- \rightarrow 3O_2+12e^-$$.

Thus, the anodic product in electrolytic reduction of alumina is $$O_2$$.
Question 3
1 / -0

Metal used for making electric cable is:

A
Lead

B
Silver

C
Tin

D
Copper

Solution

Both $$Ag$$ and $$Cu$$ are good conductor of electricity but $$Cu$$ is used to make electric cable as it is comparatively cheaper than $$Ag$$.
Question 4
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

Distillation is useful for low boiling metals like zinc and mercury. The impure metal is evaporated to obtain the pure metal as distillate.
Question 5
1 / -0

Which metal is adds to gold to make hard?

A
Copper

B
Nickel

C
Zinc

D
Silver

Solution

Pure $$24$$ carat gold is so smooth and it is not used for making jewelry. Strength comes when copper is added to it.
Question 6
1 / -0

The role of coke in the electrolytic reduction of alumina is to _______.

A
provide heat for melting of alumina

B
prevent loss of heat

C
prevent burning of carbon rods

D
reduce alumina to metal

Solution

Overall electrolytic reduction reaction-
$$2Al_2O_3 + 3C \rightarrow 4Al + 3CO_2$$
This way for each kg of aluminium produced, about 0.5 kg of carbon anode is burnt away. For preventing this we use coke.
Question 7
1 / -0

In Goldschmidt alumina thermic process, thermite mixture is:

A
3 parts $$Fe_{3}O_{3}$$ and 2 parts $$Al$$

B
3 parts $$Al_{2}O_{3}$$ and 4 parts $$Al$$

C
1 part $$Fe_{2}O_{3}$$ and 2 part $$Al$$

D
3 parts $$Fe_{2}O_{3}$$ and 1 part $$Al$$

Solution

Goldschmidt aluminathermic process contain mixture of 1 part of $$Fe_2O_3$$ and 2 part of $$Al$$.
$$Fe_2O_3 + 2Al \rightarrow 2Fe + Al_2O_3$$
Question 8
1 / -0

In electro-refining, thick sheets of pure copper are obtained at :

A
cathode

B
anode

C
electrode

D
none of the above

Solution

In the electrolysis of copper, pure copper gets deposited on the cathode while impure copper at the anode goes to the solution. So, the cathode increases in thickness.
Question 9
1 / -0

The following flow chart represents the extraction of _______.

Froth flotation
   $$\downarrow$$
Roasting
   $$\downarrow$$
Smelting
   $$\downarrow$$
Bessemerization
   $$\downarrow$$
Electrolytic refining

A
Copper

B
Zinc

C
Iron

D
Aluminium

Solution

1) Froth floatation
For froth flotation, the ground ore is mixed with water to form a slurry and the desired mineral is rendered hydrophobic by the addition of a surfactant or collector chemical (although some mineral surfaces are naturally hydrophobic, requiring little or no addition of collector).

2) Roasting
$$2CuFeS_2 + O_2 \rightarrow Cu_2S + 2FeS + SO_2$$
$$2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$$

3)Smelting
$$Cu_2O + FeS \rightarrow Cu_2S + FeO$$

4) Bessemerization
$$2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2 $$
$$2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2$$

5)Electrolytic Refining
In refining copper, an aqueous solution of copper(II) sulphate is electrolyzed, using impure copper as the anode and pure copper as the cathode.

So, the given flow chart is of the process of extraction of Copper.
Hence, the correct answer is $$(A)$$.
Question 10
1 / -0

Phosphoric acid is prepared on large scale from __________.

A
phosphorus

B
dolomite

C
phosphorite

D
malachite

Solution

Phosphoric acid is prepared on large scale from phosphorite, an ore of phosphorus or fluorapatite, known as phosphate rock, $$3Ca_3(PO_4)_2. CaF_2$$, by the addition of concentrated (93%) sulfuric acid in a series of well-stirred reactors.

Option C is correct.

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General Principles and Processes of Isolation of Elements Test - 21

Result

General Principles and Processes of Isolation of Elements Test - 21

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SHARING IS CARING

Question 1

electrorefining of copper

electroplating of copper

anodizing of copper

none of the above

Solution

Question 2

$$CO_{2}, \ \ O_{2}$$

$$O_{2}$$

$$F_{2}$$

$$O_{2},\ \ 4F_{2}$$

Solution

Question 3

Lead

Silver

Tin

Copper

Solution

Question 4

Liquation

Polling

Oxidation

Distillation

Solution

Question 5

Copper

Nickel

Zinc

Silver

Solution

Question 6

provide heat for melting of alumina

prevent loss of heat

prevent burning of carbon rods

reduce alumina to metal

Solution

Question 7

3 parts $$Fe_{3}O_{3}$$ and 2 parts $$Al$$

3 parts $$Al_{2}O_{3}$$ and 4 parts $$Al$$

1 part $$Fe_{2}O_{3}$$ and 2 part $$Al$$

3 parts $$Fe_{2}O_{3}$$ and 1 part $$Al$$

Solution

Question 8

cathode

anode

electrode

none of the above

Solution

Question 9

Copper

Zinc

Iron

Aluminium

Solution

Question 10

phosphorus

dolomite

phosphorite

malachite

Solution

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