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JEE Exam  >  JEE Tests  >  Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - JEE MCQ

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - JEE MCQ


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25 Questions MCQ Test - Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT)

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) for JEE 2024 is part of JEE preparation. The Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) questions and answers have been prepared according to the JEE exam syllabus.The Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) below.
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Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - 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. 

In the electrolytic refining of zinc

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 1

Electrodes are suspended in an electrolyte which is the solution of a soluble salt of the metal usually a double salt of the metal.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 2
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When compared to ΔG° for the formation of Al2O3 the ΔG° for the formation of Cr2O3 is

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 2

ΔG° is higher for the formation of Cr2O3.

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Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 3
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During the extraction of gold the following reactions take place

Au + CN- + H2O  X,
X + Zn → Y + Au

Here, X and Y respectively are

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 3

4Au + 8KCN + O2 + 2H2O → 4K[Au(CN)2]
[4Au(CN)2]- + Zn → [Zn(CN)4]2- + Au

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 4
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Gold is extracted by hydrometallurgical process based on its property
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 4

[Au(CN)2]- is water soluble complex.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 5
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During Hoope’s process for electrolytic refining of Al, the middle layer is of
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 5

In the Hoope’s process the middle layer consists of cryolite and BaF2.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 6
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Thermite is a mixture of iron oxide and 
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 6

Thermite is a mixture of metallic oxide (Say. FeO, Cr2O3, Mn3O4) etc. and aluminium powder.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 7
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Which is an alloy of aluminium?
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 7

Magnalium consists of aluminium with from 5% to 30% mangesium. Duralumin is a light hard aluminium alloy containing about 4% copper and small amount of mangnesium.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 8
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Which one of the following metals has the largest abundance in the earth’s crust?
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 8

Aluminium is the metal which has the largest abundance in the earth's crust.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 9
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The processes used in the refining of aluminium and zinc metals respectively are
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 9

The processes used in the refining of aluminium and zinc metals are Hoope's process and fractional distillation.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 10
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In sulphatizing roasting of ZnS products are
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 10

Due to incomplete roasting ZnSO4 is formed.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 11
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One or More than One Options Correct Type

Direction (Q. Nos. 11-15) 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. 

Purification of alumina is called
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 11

The correct answer is Option A.
The purification of alumina can be done by Baeyer's process.
In Baeyer’s process, impure bauxite is converted into pure alumina. The conversion process involves mainly three reactions:
1. Concentrated sodium hydroxide solution is heated with amphoteric bauxite at a temperature of 150 to 200°C under pressure to get sodium aluminate.
2. Sodium aluminate is then diluted with water at a temperature of 50 to 60°C. Thus, sodium aluminate gets hydrolysed to form solid aluminium hydroxide and sodium hydroxide.
3. Finally, dried aluminium hydroxide precipitate is ignited at a temperature of 1100°C to remove water molecules to get alumina.
 

*Multiple options can be correct
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 12
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Among the following statements the correct one is
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 12

Argentite (silver glance). Ag2S It is an important ore of silver. Argentite are sulphide and cuprite are oxides.

*Multiple options can be correct
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 13
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The alloys having zinc metal are
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 13

Bell metal is an alloy of copper (60% - 85%) and tin, some time including zinc or lead.
It is the type of bronze used to cost bells, German silver (Zn + Cu + Ni), Brass (Cu + Zn).

*Multiple options can be correct
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 14
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Which is a zinc compound?
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 14

White vitriol = ZnSO4 Fool’s gold = FeS2;
Philosopher’s wool = ZnO and calomel, mercury (I) chloride

*Multiple options can be correct
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 15
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Which is not a mineral of Al?
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 15

Spinel = MgO Al2O3, Feldspar = KAISi3O8,
Corundum Al2O3, Magnalium = Mg + Al alloy.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 16
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Comprehension Type

Direction (Q. Nos. 16 and 17) 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

The chief ore of zinc is ZnS.The ore is purified by floatation process and then heated in air which converts ZnS into ZnO. ZnO can be reduced with coke in Belgian process to get zinc which is purified by electrolysis.
Alternately zinc can be extracted from calamine .This after purification by levigation, subjected to calcination to get oxide. This on reduction by Belgian method followed by electrolytic refining yields pure zinc.

Q. 

Zinc oxide is converted into zinc by
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 16

Zinc oxide is converted into zinc by reduction with carbon.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 17
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Passage

The chief ore of zinc is ZnS.The ore is purified by floatation process and then heated in air which converts ZnS into ZnO. ZnO can be reduced with coke in Belgian process to get zinc which is purified by electrolysis.
Alternately zinc can be extracted from calamine .This after purification by levigation, subjected to calcination to get oxide. This on reduction by Belgian method followed by electrolytic refining yields pure zinc.

Q. 

Which of the following graph in the given figure is the Ellingham diagram of ZnO?
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 17

The third graph is the correct Ellingham diagram of Zn.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 18
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Matching List Type

Direction (Q. Nos. 18 and 19) 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.
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 18

(i) → (q), (ii) → (r), (iii) → (p), (iv) → (s)

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 19
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Match the Column I with Column II and mark the correct option from the codes given below.
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 19

(i) → (q), (ii) → (p), (iii) → (s), (iv) → (r)

*Answer can only contain numeric values
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 20
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One Integer Value Correct Type

Direction (Q, Nos. 20-24) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

Gibbsite formula is Al2O3 . xH2O. Here, value of x is

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 20

Gibbsite is AI2O3.3H2O.

*Answer can only contain numeric values
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 21
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Gold is soluble in aqua-regia which is cone. HNO3 and cone. HCI in 1: x ratio. Then the value of x is

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 21

Gold dissolves in aq ua regia i.e. HNO3 and HCI (1:3) ratio.

*Answer can only contain numeric values
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 22
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Duralumin is an important alloy of aluminium .This has 95% Al and ...... % copper.

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 22

Duralumin is Al 95%, Cu 4%, Mg 0.5% and Mn 0.5%.

*Answer can only contain numeric values
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 23
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Al is amphoteric metal and liberate hydrogen by reacting with both with dilute acids and bases . 2 moles of Al metal when reacted with either acid or base, the number of moles of dihydrogen liberated is ......

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 23

2 moles of Al = 6 equivalents Ai.Therefore hydrogen produced is also 6 equivalents i.e. 6g = 3 moles.

*Answer can only contain numeric values
Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 24
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During the Hall-Heroult process of preparing Al metal from purified bauxite, if 3 moles of O2 is formed at anode the number of moles of Al formed at cathode is

Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 24

6O2- → 3O2 + 12e- and 4AI3+ + 12e- → 4AI.
This shows that for every 3 moles of oxygen 4 moles Al is formed.

Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 25
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Statement Type

Direction (Q. No. 25) This section is based,on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : Many gem stones are impure forms of alumina (Al2O3).

Statement II : In cyanide process gold (Au) is treated with a cone, solution of sodium or potassium cyanide.
Detailed Solution for Test: Metallurgy of Some Important Elements (Al, Zn, Au) (Old NCERT) - Question 25

Many gem stones are impure forms of alumina (Al2O3) for e.g. The impurity present in ruby is Cr while sapphire contains Co as the impurity. In cyanide process dilute solution (0.5%)of sodium or potassium cyanide is used.

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