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General Principles and Processes of Isolation of Metals - 1 - JEE MCQ


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30 Questions MCQ Test - General Principles and Processes of Isolation of Metals - 1

General Principles and Processes of Isolation of Metals - 1 for JEE 2024 is part of JEE preparation. The General Principles and Processes of Isolation of Metals - 1 questions and answers have been prepared according to the JEE exam syllabus.The General Principles and Processes of Isolation of Metals - 1 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for General Principles and Processes of Isolation of Metals - 1 below.
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General Principles and Processes of Isolation of Metals - 1 - Question 1
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Aluminium is industrially prepared by -  

[AIEEE-2002]

Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 1

The correct answer is Option D.
The Hall–Héroult process is the major industrial process for smelting aluminium. It involves dissolving aluminium oxide (alumina) (obtained most often from bauxite, aluminium's chief ore, through the Bayer process) in molten cryolite, and electrolysing the molten salt bath, typically in a purpose-built cell.
 

General Principles and Processes of Isolation of Metals - 1 - Question 2
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The substance not likely to contain CaCO3 is –

[AIEEE-2003]

Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 2

The correct answer is option D
A) On heating, gypsum loses water and gives the hemihydrate (CaSO4. 1/2H2O) or the anhydrite. The hemihydrate known as Calcined gypsum/ Plaster of Paris / stucco is an important building material.
B) Seashells are the exoskeletons of mollusks such as snails, clams, oysters and many others. Such shells have three distinct layers and are composed mostly of calcium carbonate(CaCO​3).
C) Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO3​)2​. 
D) A marble statue typically consists of calcium carbonate.
So Calcined gypsum does not have calcium carbonate.

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General Principles and Processes of Isolation of Metals - 1 - Question 3
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Which one of the following ores is best concentrated by froath-flotation method ?

[AIEEE-2004]

Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 3

The correct answer is Option C.

Galena (PbS)  is best concentrated by a froth-floatation method.
This method is used for the concentration of sulphide ores such as galena (PbS), zinc blende (ZnS) and copper pyrite (CuFeS2).

General Principles and Processes of Isolation of Metals - 1 - Question 4
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During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud'. These are –  

[AIEEE-2005]
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 4

The correct answer is option D
In Electrolytic refining, the impure metal is made to act as an anode. A strip of the same metal in pure form is used as a cathode. 
They are put in a suitable electrolytic bath containing a soluble salt of the same metal. 
The more basic metal remains in the solution and the less basic ones go to the anode mud.
Copper is refined using an electrolytic method.
Impurities from the blister copper deposit as anode mud which contains antimony, selenium, tellurium, silver, gold, and platinum; recovery of these elements may meet the cost of refining.

General Principles and Processes of Isolation of Metals - 1 - Question 5
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Heating mixture of Cu2O and Cu2S will give –

[AIEEE-2005]
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 5

The correct answer is Option B.

Heating a mixture of Cu2O and Cu2S will give Cu+SO2
 
2Cu2O+Cu2S→6Cu+SO2
​
This reaction takes place during bessemerization and is an auto reduction process to give copper metal.

General Principles and Processes of Isolation of Metals - 1 - Question 6
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Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly ?  

[AIEEE-2008]
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 6

Metal sulphides are less stable than the corresponding oxides
Explanation:

General Principles and Processes of Isolation of Metals - 1 - Question 7
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General Principles and Processes of Isolation of Metals - 1 - Question 8
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Extraction of zinc from zinc blende is achieved by :
General Principles and Processes of Isolation of Metals - 1 - Question 9
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Select correct statement
General Principles and Processes of Isolation of Metals - 1 - Question 10
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Main source of lead is PbS. It is converted to Pb by :

Self - reduction pocess is :
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 10

PbS reduces PbO to Pb and SO2 is liberated. This is called as self-reduction.

General Principles and Processes of Isolation of Metals - 1 - Question 11
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Among the following statements, the incorrect one is :
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 11

(A) Calamine = ZnCO3 , Siderite = FeCO3

(B) Argentite = Ag2S and cuprite = Cu2O

(C) Zinc blende = ZnS, Pyrites = FeS2

(D) Malachite = CuCO3 Cu(OH)2 , Azurite = 2CuCO3 Cu(OH)2

General Principles and Processes of Isolation of Metals - 1 - Question 12
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Which of the following statement is incorrect about the extractive metallurgy of copper ?
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 12

Most of the impurity of iron sulphide is removed in smelting process 2 FeS + 3O2 → 2FeO + 2SO2

FeO + SiO2 → FeSiO3 (slag)

General Principles and Processes of Isolation of Metals - 1 - Question 13
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Main function of the collectors in metallurgy is:
General Principles and Processes of Isolation of Metals - 1 - Question 14
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General Principles and Processes of Isolation of Metals - 1 - Question 15
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Which one of the following statements is incorrect ?
General Principles and Processes of Isolation of Metals - 1 - Question 16
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General Principles and Processes of Isolation of Metals - 1 - Question 17
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General Principles and Processes of Isolation of Metals - 1 - Question 18
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General Principles and Processes of Isolation of Metals - 1 - Question 19
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In purification of bauxite ore, it is mixed with coke and heated at 1800 °C in presence of nitrogen. this is :
General Principles and Processes of Isolation of Metals - 1 - Question 20
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Which of the following process is used in the extractive metallurgy of magnesium ?
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 20

From salts of magnesium, magnesium can not be extracted by other chemical methods as magnesium itself acts as a reducing agent and Mg obtained at cathode during electrolysis of its salt solution, reacts with water forming Mg(OH)2.

General Principles and Processes of Isolation of Metals - 1 - Question 21
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NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS minerals are expected because :
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 21

ZnS + 4NaCN → Na2[Zn(CN)4] (soluble complex) + Na2S

General Principles and Processes of Isolation of Metals - 1 - Question 22
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Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron ?
General Principles and Processes of Isolation of Metals - 1 - Question 23
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When haematite ore is burnt in air with coke along with lime at 200°C, the process not only produces steel but also produces an important compound (A), which is useful in making building materials. The compound (A) is
General Principles and Processes of Isolation of Metals - 1 - Question 24
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General Principles and Processes of Isolation of Metals - 1 - Question 25
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The ore that contains the metal in the form of fluoride is :
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 25

Cryolite = Na3AlF6
Contain fluoride

General Principles and Processes of Isolation of Metals - 1 - Question 26
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Match the column (I) and (II) and select the correct answer using the codes given below.
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 26

Argentite → Ag2S ; Cuprite → Cu2O ; Siderite → FeCO3 ; Carnallite → KCl. MgCl2 . 6H2O

General Principles and Processes of Isolation of Metals - 1 - Question 27
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General Principles and Processes of Isolation of Metals - 1 - Question 28
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General Principles and Processes of Isolation of Metals - 1 - Question 29
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The one that is not a carbonate ore is :
Detailed Solution for General Principles and Processes of Isolation of Metals - 1 - Question 29

Malachite = CuCO3. Cu(OH)2
Bauxite = Al2O3 . 2H2O or AlOx . (OH)3–2x (where D < x < 1)
Calamine = ZnCO3
Siderite = FeCO3
Ans is Bauxite option-2.

General Principles and Processes of Isolation of Metals - 1 - Question 30
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