Isolation of Elements Test 8

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Isolation of Elements Test 8

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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 correct.
Q.
Which one of the following is the major impurity in pig iron?

A
Graphite

B
Sulphur

C
Silicon

D
Phosphorus

Solution

It is an impure form of iron cast into blacks (Pigs) obtained from iron over by blast furnace process.
Graphite is the major impurity in pig iron. Pig-iron is later converted into cast iron or steel.
Question 2
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In smelting the furnace most suitable is

A
Blastfurnace

B
Reverberatory furnace

C
Open hearth furnace

D
Muffle furnace

Solution

Blast furnace is most suitable for smelting which is used for the manufacture of cast iron.
Question 3
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Silver from argentiferous lead is obtained by

A
Pattinson’s process

B
Parke’s process

C
Haber's process

D
Cyanide process

Solution

Cyanide process is used for gold and silver as follow
Question 4
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Which of the following has lowest carbon content?

A
Cast iron

B
Wrought Iron

C
Stainless steel

D
Chrome steel

Solution

Wrought iron is an iron with a very low carbon (less than 0.08%) content in contrast to cast iron (2.1 to 4%). Stainless steel contain maximum of 0.15 % carbon. Chrome steel contains high carbon content.
Question 5
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During the process of electrolytic refining of copper, some metals present as impurity settle as anode mud. These are

A
Ag and Au

B
Fe and Ni

C
Sn and Ag

D
Pb and Zn

Solution

The impurities of more electropositive metais remain as ions in the bath whereas impurities of less electropositive metals (Ag and Au) remain unionised and settle down under the anode as anode mud or anode sludge.
Question 6
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2CuCO₃ . Cu(OH)₂ is the formula of

A
Azurite

B
Malachite

C
Siderite

D
Chalcopyrite

Solution

Azurite is an copper Ore [2CuCO₃⋅Cu(OH)₂]
Question 7
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The temperature of the slag zone in the metallurgy of iron using blast furnace is

A
400-700°C

B
1200-1500°C

C
800-1000°C

D
1500-1600°C

Solution

Slag zone is the zone of blast furnace where flux and gangue mix to form slag.
Question 8
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The Puddler’s candles are produced due to the burning of

A
carbon

B
carbon monoxide

C
hydrogen

D
None of these

Solution

In the conversion of cast iron into wrought iron, the carbon impurities present as Fe₃C are oxidised and escapes as carbon monoxide.
Question 9
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In the extraction of copper, the metal formed in the Bessemers convertor is due to the reaction

A
Cu₂S → 2Cu + S

B
2Cu₂O → 4Cu + O₂

C
2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

D
2Cu₂O + Cu₂S → 6Cu + SO₂

Solution

Cuprous sulphide (Cu₂S) and cuprous oxide (Cu₂O) react with each other to form copper metal along with evolution of SO₂ gas.
Question 10
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Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of

A
nitrogen

B
oxygen

C
carbon dioxide

D
argon

Solution

Ag₂S + 4NaCN + 2O₂ →2Na[Ag(CN)₂] + Na₂SO₄
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 code.

A

B

C

D

Solution

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

A

B

C

D

Solution

(i) → (r,s), (ii) → (p), (iii) → (r), (iv) → (t)
Question 13
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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 : Silver is obtained from its cyanide complex during leaching.
Statement II : Copper can be extracted by poling process when it contain Cu₂O as 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

Statement II does not explains the statement correctly.