Principles & Isolation of Elements Test

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Principles & Isolation of Elements Test - 11

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Question 1
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One or More than One Options Correct Type

Direction (Q. Nos. 1-5) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q.

In the following processes, which are not sulphatising roasting ?

A
2ZnS + 3O₂ →2ZnO + 2SO₂

B
2Cu₂ S + 3O₂ →2Cu₂ O + 2SO₄

C
Ag₂ S + 2NaCI + 2O₂ →2AgCl + Na₂ SO₄

D
Option A,B,C are Correct

Solution

22ZnS + 3O₂ →2ZnO + 2SO₂ ,
2CU₂ S + 3O₂ →2Cu₂ O + 2SO₂
Ag₂ S + 2NaCI + O₂ →2AgCI + Na ₂ SO₄
Question 2
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In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

A
Copper (I) sulphide (Cu₂ S)

B
sulphur dioxide (SO₂ )

C
Iron sulphide (FeS)

D
Carbon monoxide (CO)

Solution

n the extraction of copper from its sulphide ore, when ore is subjected to roasting, some of it is oxidised to Cu₂ O which reacts with the remaining Cu₂ S (sulphide ore) to give copper metal.
Cu₂ S +2Cu₂ O →6Cu +SO₂ ↑
In this process, Cu₂ S behaves as reducing agent.
Question 3
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Which is correctly matched?

A
Pyrometallurgy = Fe, Zn and Cu

B
Electrometallurgy = Al, Mg and Na

C
Hydrometallurgy = Ag and Au

D
Option A,B,C are Correct

Solution

Pyrometallurgy = Fe, Zn and Cu
Electrometallurgy = Al, Mg and Na
Hydrometallurgy = Ag and Au
Question 4
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Which of tlfe following metal sulphides are converted into metals by self reduction?

A
Cu₂ S and PbS

B
PbS and HgS

C
PbS and ZnS

D
Option A,B are Correct

Solution

Self reduction or auto-reduction or self electronation
Question 5
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Which of the following are correct process ?

A
ZnO + C →Zn + CO

B
Cr₂ O₃ + 2AI →2Cr + Al₂ O₃

C
2Na[Au(CN)₂ ] + Zn →Na₂ [Zn(CN)₄ ] + 2Au

D
Option A,B,C are Correct

Solution

The process of reduction of metal oxide to the metal with the help of aluminium powder as the reducing agent is called Goldschmidt thermite process.
2AI + Fe₂ O₃ →Al₂ O₃ + 2Fe
Question 6
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Comprehension Type

Direction : This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Copper is extracted from copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into silica lined convertor. Some silica is also added and a hot air blast is blown into the mixture to obtain blister copper which is purified by electro refining.

Q.

The chemical formula of copper pyrites is

A
CuFeS₂

B
Cu₂ S

C
Cu₂ O

D
CuCO₃ Cu(OH)₂

Solution

Copper pyrites is CuFeS₂ . Copper can be extracted from this by roasting of sulphide partially and reduction.
Question 7
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Copper is extracted from copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into silica lined convertor. Some silica is also added and a hot air blast is blown into the mixture to obtain blister copper which is purified by electro refining.

Q.

Coke is added during smelting

A
to reduce FeO to Fe

B
to reduce Cu₂ O to Cu

C
to check the oxidation of FeO to Fe₂ O₃

D
all of these

Solution

Carbon (coal or coke) reduces the metal oxide to the free metal, e.g.

The carbon monoxide obtained by the incomplete combustion of carbon can also bring about the reduction of metal oxides to free metal. e.g.
Question 8
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Matching List Type

Direction : 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) →(s), (iii) →(r), (iv) →(p)
Low electropositive metal oxides like Fe₂ O₃ and ZnO can be reduced by CO. Cr₂ O₃ cannot be reduced by CO or C because of their high melting point, some metal sulphides self reduced during roasting like CU₂ S, PbS and HgS.
Question 9
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Match the Column I with Column II and mark the correct option from the codes given below.

A

B

C

D

Solution

(i) →(r), (ii) →(p,t), (iii) →(q), (iv) →(s)
Question 10
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One Integer Value Correct Type

Direction : This section contains 5 questions. When worked out will result is an integer from 0 to 9 (both inclusive)

Q.

Among Ca, Pb, Sn, Ag, Mg, Au, Zn, Cu, Al, Na, Hg the number of metals extracted by pyrometallurgy are

A
4

B
3

C
2

D
1

Solution

Pyrometallurgy It is a branch of extractive metallurgy. It involves the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformation in the materials to enable recovery of valuable metals.
It include the extraction of oxide of less reactive elements like, Pb, Sn, Zn and Cu.
Question 11
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Among Ca, Pb, Sn, Ag, Mg, Au, Zn, Cu, Al, Na, Hg, K, the number of metals extracted by electrometallurgy are

A
1

B
6

C
9

D
0

Solution

Metals except Pb, Ag, Au, Sn, Cu, Hg, are separated by Electrometallurgy. Electrometallurgy is the process of extraction of metals by electrolysis of their fused salt.
Question 12
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in this how many CN^- ions are involved in the balanced equation?

A
0

B
1

C
8

D
9

Solution

4Au + 8CN^- + 2H₂ O + O₂ →4[Au(CN)₂ ]^- + 4OH^-
Question 13
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In the electrolytic extraction of Al at cathode Al metal and at anode F₂ gas is liberated. If the molar ratio of Al and F₂ is 2 : x, here value of is x

A
0

B
8

C
9

D
3

Solution

The molar ratio of Al and F₂ is 2 : 3.
Question 14
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In Goldschmidt alum inothermic process, therm it mixture contains ...... parts Fe₂ O₃ and one part Al powder.

A
3

B
4

C
5

D
9

Solution

In thermite mixture contains 3 parts of Fe₂ O₃ and one part of Al.
Question 15
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Statement Type

Direction : This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q.

Statement I : Cast iron is obtained by remelting pig iron with scrap iron and coke wing hot air blast.
Statement II : In the extraction of silver, silver is extracted as cationic complex.

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

Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
In the extraction of silver, silver is extracted as anionic complex [Ag(CN)₂ ],