CBSE Class 12 General Principles and Processes of Isolation of Elements Multiple Choice Questions with Answers. MCQ Questions Class 12 General Principles and Processes of Isolation of Elements with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 General Principles and Processes of Isolation of Elements MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 General Principles and Processes of Isolation of Elements with Answers - Set - 3
Question 1:
In metallurgical process of aluminium, cryolite is mixed with alumina in its molten state, because it
(a) decreases the amount of alumina
(b) oxidises the alumina
(c) increases the melting point of alumina
(d) decreases the melting point of alumina
Correct Answer – (D)
Question 2 :
Which of the following is a carbonate ore?
(a) Pyrolusite
(b) Malachite
(c) Diaspore
(d) Cassiterite
Correct Answer – (B)
Question 3 :
Mac Arthur process is used for the extraction of:
(a) Au
(b) Pt
(c) Cu
(d) Zn
Correct Answer – (A)
Question 4 :
Froth floatation is a process of:
(a) Oxidation
(b) Reduction
(c) Refining
(d) Concentration
Correct Answer – (D)
Question 5 :
The process does not involve a catalyst is :
(a) Haber process
(b) Contact process
(c) Thermite process
(d) Ostwald process
Correct Answer – (C)
MCQ Questions Class 12 General Principles and Processes of Isolation of Elements with Answers
Question 6:
Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of metals?
(a) FeO, SnO
(b) SnO, ZnO
(c) BaO, Na2O2
(d) FeO, ZnO
Correct Answer – (D)
Question 7:
In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu2O with :
(a) FeS
(b) C O
(c) Cu2S
(d) SO2
Correct Answer – (C)
Question 8:
Flux is used to remove :
(a) basic impurities
(b) acidic impurities
(c) all types of impurities
(d) acidic and basic both impurities
Correct Answer – (D)
Question 9:
Chief ore of Al is :
(a) cryolite
(b) bauxite
(c) feldspar
(d) kaolin
Correct Answer – (B)
Question 10:
The method of zone refining of metals is based on the principle of
(a) greater mobility of the pure metal than that of the impurity
(b) higher melting point of the impurity than that of the pure metal
(c) greater noble character of the solid metal than that of the impurity
(d) greater solubility of the impurity in the molten state than in the solid.
Correct Answer – (D)
- NCERT Solutions Class 11 Chemistry Chapter 1 : Some Basic Concepts of Chemistry
- NCERT Solutions Class 11 Chemistry Chapter 2 : Structure Of The Atom
- NCERT Solutions Class 11 Chemistry Chapter 3 : Classification of Elements and Periodicity in Properties
- NCERT Solutions Class 11 Chemistry Chapter 4 : Chemical Bonding and Molecular Structure
- NCERT Solutions Class 11 Chemistry Chapter 5 : States of Matter
- NCERT Solutions Class 11 Chemistry Chapter 6 : Thermodynamics
- NCERT Solutions Class 11 Chemistry Chapter 7 : Equilibrium
- NCERT Solutions Class 11 Chemistry Chapter 8 : Redox Reactions
- NCERT Solutions Class 11 Chemistry Chapter 9 : Hydrogen
- NCERT Solutions Class 11 Chemistry Chapter 10 : The s-Block Elements
- NCERT Solutions Class 11 Chemistry Chapter 11 : The p-Block Elements
- NCERT Solutions Class 11 Chemistry Chapter 12 : Organic Chemistry: Some Basic Principles and Techniques
- NCERT Solutions Class 11 Chemistry Chapter 13 : Hydrocarbons
- NCERT Solutions Class 11 Chemistry Chapter 14 : Environmental Chemistry
