Isolation of Elements Test 3

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Isolation of Elements Test 3

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Question 1
1 / -0

Only One Option Correct Type
Direction (Q. Nos. 1-9) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Which of the following is not correctly matched ?

A
Smelting process Cu and Fe

B
Leaching: Extraction of Au, Ag

C
Cyanide process : Extraction of Sn and Pb

D
Electrolyte reduction : Extraction of Al

Solution

Cyanide process The extraction of gold from its ores by dissolving the gold in a solution of potassium cyanide, KCN. The resulting potassium aurocyanide, KAu(CN)₂, with zinc, filtering off, melting down and cupelling the metal.
Question 2
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In Mac Arthur Forest method, silver is extracted from the solution of Na[Ag(CN)₂] by the use of

A
Fe

B
Mg

C
Cu

D
Zn

Solution
Question 3
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In the extraction of copper, the metal formed in the Bessem er’s convertor is due to the reaction

A
Cu₂S → 2Cu + S

B
2CuzO → 4Cu + O₂

C
2 Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

D
2Cu₂O + Cu₂S → 6Cu + SO₂

Solution

Some times the sulphide ore may be oxidised to sulphate which is then reduced to the free metal by the excess of the sulphide ore.
Question 4
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The nitrate of which metal leaves metallic globule on strongly heating ?

A
Cu(NO₃)₃

B
AgNO₃

C
NaNO₃

D
Pb(NO₃)₂

Solution

The nitrate of AgNO₃ leaves metallic globule on strongly heating.
Question 5
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In the extraction of gold, the cyanide solution acts as a

A
leaching agent that dissolves the impurities

B
leaching agent that acts as a complex forming reactant

C
flux

D
reducing agent that converts the metal oxide or sulphide into the metal

Solution

When the gold pass in to the solution of sodium or potassium cyanide forming the respective soluble complex cyanides while the impurities remain unaffected which are filtered off.
Question 6
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The matte is impure substance obtained during the extraction of

A
iron

B
copper

C
lead

D
aluminium

Solution

The suphide ores of copper are heated in reverberatory furnace. If the ore contains iron. It is mined with silica before heating. Iron oxide slags of as iron silicate and copper produced in the form of copper matte , which contain Cu₂S and FeS.
Question 7
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During the extraction of gold the following reactions takes place
Au + CN^- + H₂O X,
X + Zn → Y + Au

A
[Au(CN)₂]^- and [Zn(CN)₄]^2-

B
[Au(CN)₄]^3- and [Zn(CN)₄]^2-

C
[Au(CN)₄]^2- and [Zn(CN)₄]^2-

D
[Au(CN)₂]^- and [Zn(CN)₆]^4-

Solution
Question 8
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Identify the reaction that does not take place in a blast furnace

A
CaCO₃ → CaO + CO₂

B
CaO + SiO₂ → CaSiO₃

C
2Fe₂O₃ + 3C → 4Fe + 3CO

D
CO₂ + C → 2CO

Solution

Iron is produced by the following reaction.
FeO + C → Fe + CO
Question 9
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Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as reducing agent and its acid is never isolated. The gas X is

A
H₂S

B
SO₂

C
CO₂

D
SO₃

Solution

The reactions involve in roasting process.
2ZnS + 3O₂ → 2ZnO + 2SO₂
2PbS + 3O₂ → 2PbO + 2SO₂
2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂
The SO₂ produced is utilised for manufacturing H₂SO₄.
Question 10
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Matching List Type
Direction (Q. Nos. 10 and 11) 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 Fe₂O₃ and ZnO can be reduced by CO. Cr₂O₃ cannot be reduced by CO or C because of their high melting point, some metal sulphides self reduced during roasting like CU₂S, PbS and HgS.
Question 11
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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 12
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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],