Isolation of Elements Test 7

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Isolation of Elements Test 7

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Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correc
Q.
Poling process is used

A
for the removal of Cu₂O from Cu

B
for the removal of Al₂O₃ from Al

C
for the removal of Fe₂O₃ from Fe

D
In all of these

Solution

Poling (metallurgy) is a method employed in the purification of copper which contains cuprous oxide as an impurity.
Question 2
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In the electrolytic refining of zinc

A
the impure metal is at the cathode

B
graphite is at the anode

C
acidified zinc sulphate is the electrolyte

D
the metal ion gets reduced at the anode

Solution

In this method, the impure metal is converted into a block which forms the anode while cathode is made up of a pure strip of the same metal. These electrodes are suspended in an electrolyte which is the solution of a soluble salt of the metal usually double salt of the metal.
Question 3
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The super pure silicon can be obtained by

A
fractional distillation

B
fractional crystallisation

C
zone refining

D
solvent extraction

Solution

Zone refining This method is employed for preparing extremely pure metals. Germanium, silicon, boron, gallium and indium are purified by this method.
This method is based upon the principle that when a molten solution of the impure metal is allowed to cool the pure metal crystallises out while the impurities remain in the melt.
Question 4
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Purification of aluminium is called

A
Baeyer’s process

B
Bosch process

C
Castner’s process

D
Hoopes process

Solution

The Hoope's process is a metallurgical process used to obtain the aluminium metal of very high purity. It gives about 99.99% pure aluminium.
Question 5
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The processes used in the refining of aluminium and zinc metals respectively are

A
Hoopes’ process and fractional distillation

B
Hoopes’ process and cupellation

C
Poling and fractional distillation

D
cupellation and fractional distillation

Solution

Cupellation This method is applied when the impure metal contains impurities of other metals which form volatile oxides. Distillation process This method is employed for purification of volatile metals like zinc, mercury, cadmium etc. The impure metal is heated in an iron retort and the vapours are condensed in separate receivers.
Question 6
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van Arkel method of purification of metals involves converting the metal to

A
volatile stable compound

B
volatile unstable compound

C
non-volatile stable compound

D
non-volatile unstable compound

Solution

van Arkel method This method is used for preparation of ultra pure metals such as titanium and zirconium which are used in space technology. In this method, zirconium is heated in iodine vapours at about 870 K to form unstable volatile zirconium tetraiodide which when heated over a tungsten filament at 2075 K decompose to give pure zirconium.
Question 7
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The most electropositive metals are extracted from their ores by

A
high temperature reduction with carbon

B
self reduction

C
displacement method

D
electrolysis of fused ionic salts

Solution

The extraction of highly electropositive metals is carried out by electrolysis of their oxides, hydroxides etc., in fused state because their compounds are not reduced by ordinary reducing agents.
Question 8
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Which method of purification is represented by the following equation?

A
Cupellation

B
Poling

C
van Arkel

D
Zone refinin

Solution

van Arkel method This method is used in the production of ultra-pure titanium and zirconium. It primarily involves the formation of the metal iodides and their subsequent decompositon to yield pure metal.
Question 9
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Which of the following process is used in the extractive metallurgy of magnesium?

A
Fused salt electrolysis

B
Self reduction

C
Aqueous solution electrolysis

D
Thermite reduction

Solution

Since Mg is highly electropositive its extractive metallurgy is carried out by fused salt electrolysis.
Question 10
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In the electrolytic refining of copper using CuSO₄ as electrolyte the anod reaction is

A
4OH^- → O₂ + 2H₂O + 4e^-

B
Cu²⁺ + 2e^- → Cu

C
Cu → Cu²⁺ + 2e^-

D

Solution

The process takes place are under.

The net result is the transfer of pure metal from the anode to the cathode,
Question 11
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Matching List Type
Direction (Q. No. 11 and 12) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Q.
Match the Column I with Column II and mark the correct option from the codes given below.

A

B

C

D

Solution

(i) → (q), (ii) → (r), (iii) → (s), (iv) → (p)
Question 12
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Match the Column I with Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution

(i) → (q), (ii) →(p), (iii) → (s), (iv) → (r)
Question 13
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Statement Type
This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Q.
Satement I : In electrorefining process cathode is made up of a pure strip of the same metal.
Statement II : Blister copper contains 50% impurities.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Blister copper contains 0 - 2 % impurities.