General Principles and Processes of Isolation of Elements MCQs

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General Principles and Processes of Isolation of Elements MCQs: Class 12 Chemistry, Chapter 6, focuses on the general principles and processes involved in the extraction and isolation of elements. This chapter is an essential part of the CBSE Chemistry syllabus, providing foundational knowledge on how metals and non-metals are obtained from their ores. Students learn about different extraction methods, such as froth flotation, electrolytic reduction, and smelting, and their relevance in industry.

The chapter helps students understand the importance of these processes in real-world applications, including the extraction of iron, copper, and aluminum. It also covers concepts related to thermodynamics, chemical reactivity, and the role of reagents in the extraction process. Typically, students can expect 3-5 questions from this chapter in the exam, including both theoretical and application-based questions. This knowledge is crucial for higher studies in chemistry, especially for those pursuing engineering, medicine, or other science-related fields.

General Principles and Processes of Isolation of Elements

MCQs for CBSE Class 12 Chemistry Chapter 6 – General Principles and Processes of Isolation of Elements. The questions and answers are available in PDF format, aligned with the latest CBSE syllabus. These MCQs are designed by expert educators to ensure comprehensive understanding and exam readiness. By practicing these questions, students can reinforce key concepts and improve their performance in areas that need more focus.

Also Read Class 12 Other Chapters MCQs:

Class 12 Chemistry MCQ General Principles and Processes of Isolation of Elements

Q1. Which of the following is the first step in the extraction of metal from its ore?

a) Roasting
b) Crushing
c) Smelting
d) Refining
Answer: b) Crushing

Q2. Which of the following methods is used for the extraction of sodium from sodium chloride?

a) Electrolysis
b) Smelting
c) Roasting
d) Froth flotation
Answer: a) Electrolysis

Q3. In the extraction of copper, the first step is:

a) Roasting of copper ore
b) Electrolytic reduction
c) Leaching with H2SO4
d) Smelting
Answer: a) Roasting of copper ore

Q4. Which of the following is NOT an ore of aluminum?

a) Bauxite
b) Cryolite
c) Galena
d) Diaspore
Answer: c) Galena

Q5. What is the main principle of froth flotation method?

a) Differences in melting points
b) Differences in solubility
c) Differences in electrical conductivity
d) Differences in surface properties
Answer: d) Differences in surface properties

Q6. In the extraction of iron, the reduction of iron oxide (Fe2O3) is achieved by:

a) Carbon monoxide
b) Hydrogen
c) Carbon
d) Both a and c
Answer: d) Both a and c

Q7. Which of the following is the most commonly used method for refining copper?

a) Electrorefining
b) Distillation
c) Zone refining
d) Fractional crystallization
Answer: a) Electrorefining

Q8. Which of the following is used to extract gold from its ore?

a) Cyanide process
b) Froth flotation
c) Leaching with HCl
d) Hydrometallurgy
Answer: a) Cyanide process

Q9. Which of the following is a method of concentration used in the extraction of zinc?

a) Froth flotation
b) Magnetic separation
c) Leaching
d) Hydraulic washing
Answer: c) Leaching

Q10. Which one of the following ores is used for the extraction of aluminum?

a) Hematite
b) Bauxite
c) Galena
d) Zinc blende
Answer: b) Bauxite

Q11. What is the function of limestone in the extraction of iron?

a) Acts as a reducing agent
b) Removes impurities
c) Increases the temperature
d) Helps in leaching
Answer: b) Removes impurities

Q12. The method used for the extraction of silver is:

a) Electrolysis
b) Cyanide process
c) Roasting
d) Smelting
Answer: b) Cyanide process

Q13. In which of the following processes is zinc oxide reduced to zinc?

a) Smelting
b) Roasting
c) Electrolysis
d) Carbon reduction
Answer: d) Carbon reduction

Q14. Which of the following is the major impurity present in bauxite ore?

a) Iron oxide
b) Zinc oxide
c) Sulphur
d) Copper oxide
Answer: a) Iron oxide

Q15. The extraction of lead from galena involves:

a) Roasting
b) Reduction with carbon
c) Froth flotation
d) All of the above
Answer: d) All of the above

Q16. Which of the following methods is employed in the extraction of gold from its ore?

a) Leaching with cyanide
b) Electrolysis
c) Froth flotation
d) Reduction with carbon
Answer: a) Leaching with cyanide

Q17. In the extraction of iron, the carbon monoxide acts as:

a) An oxidizing agent
b) A reducing agent
c) A flux
d) A catalyst
Answer: b) A reducing agent

Q18. The ore from which zinc is extracted is called:

a) Bauxite
b) Zinc blende
c) Galena
d) Magnetite
Answer: b) Zinc blende

Q19. Which of the following metals is extracted using the electrolytic reduction method?

a) Iron
b) Copper
c) Aluminum
d) Zinc
Answer: c) Aluminum

Q20. In the extraction of aluminum from bauxite, which compound is used as an electrolyte?

a) Sodium chloride
b) Aluminum oxide
c) Cryolite
d) Calcium carbonate
Answer: c) Cryolite

Q21. The process of refining copper by electrolysis is called:

a) Electrorefining
b) Electroplating
c) Zone refining
d) Distillation
Answer: a) Electrorefining

Q22. Which of the following methods is used for the extraction of gold?

a) Cyanide process
b) Froth flotation
c) Leaching with acids
d) Smelting
Answer: a) Cyanide process

Q23. Which of the following is an example of a method used to concentrate ores?

a) Leaching
b) Roasting
c) Froth flotation
d) Electrolysis
Answer: c) Froth flotation

Q24. The role of carbon in the extraction of metals is primarily to:

a) Act as a reducing agent
b) Act as a catalyst
c) Remove impurities
d) Increase temperature
Answer: a) Act as a reducing agent

Q25. Which of the following metals is extracted using the process of roasting?

a) Iron
b) Copper
c) Zinc
d) Lead
Answer: b) Copper

Q26. In the extraction of aluminum, the compound that facilitates the melting of aluminum oxide is:

a) Sodium chloride
b) Cryolite
c) Calcium oxide
d) Barium sulfate
Answer: b) Cryolite

Q27. Which method is used for the extraction of high-purity silicon?

a) Electrolytic reduction
b) Zone refining
c) Cyanide process
d) Froth flotation
Answer: b) Zone refining

Q28. What is the primary purpose of using flux during the extraction of metals?

a) To increase the temperature
b) To remove impurities
c) To reduce ores
d) To stabilize the metal
Answer: b) To remove impurities

Q29. Which of the following is used in the extraction of zinc from its ores?

a) Carbon monoxide
b) Cyanide
c) Sodium hydroxide
d) Sulfuric acid
Answer: a) Carbon monoxide

Q30. The reduction of iron oxide in a blast furnace is achieved using:

a) Hydrogen
b) Nitrogen
c) Carbon monoxide
d) Sodium chloride
Answer: c) Carbon monoxide

Advantages of Solving General Principles and Processes of Isolation of Elements MCQs

Enhanced Conceptual Clarity: Practicing MCQs helps in reinforcing the fundamental concepts of metallurgical processes, refining techniques, and extraction methods, ensuring a strong grasp of the subject.
Time Management: Solving multiple-choice questions within a set timeframe improves speed and accuracy, which is crucial for competitive exams like NEET.
Quick Revision: MCQs cover a wide range of topics in a concise format, making it easier to review important points and recall them quickly during exams.
Improved Analytical Skills: Analyzing and solving MCQs sharpens problem-solving abilities, helping students to think critically and apply their knowledge effectively.
Identification of Weak Areas: Regular practice of MCQs highlights areas where more focus is needed, enabling targeted revision and better preparation.
Exam Pattern Familiarity: Continuous practice with MCQs familiarizes students with the format and style of questions typically asked in exams, reducing anxiety and boosting confidence.
Effective Self-Assessment: MCQs provide an instant evaluation of one’s understanding and preparedness, allowing students to track their progress and adjust their study strategies accordingly.
Boosts Accuracy: Practicing MCQs helps in minimizing errors, enhancing precision in answering questions, which is crucial for achieving higher scores in competitive exams.
NEET Exam Relevance: This chapter is significant as NEET often includes questions from “General Principles and Processes of Isolation of Elements.” Regular practice ensures familiarity with the types of questions that may appear, improving overall performance in the exam.