General Principles and Processes of Isolation of Elements Quiz - CBSE Class 11 Science

Free practice quiz: General Principles and Processes of Isolation of Elements (CBSE Class 11 Science). 29 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Science practice quiz has 29 multiple-choice questions on General Principles and Processes of Isolation of Elements, and 29 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which method is commonly used for the extraction of highly reactive metals like sodium and potassium?

   1. Electrolytic reduction
   2. Carbon reduction
   3. Self-reduction
   4. Thermal decomposition
   Show answer

   Answer: A. Electrolytic reduction

   Highly reactive metals cannot be extracted by conventional methods like carbon reduction due to their high reactivity. Electrolytic reduction is used to extract them from their molten salts.

2. Which method is used for the purification of metals containing volatile impurities?

   1. Zone refining
   2. Liquation
   3. Chromatography
   4. Distillation
   Show answer

   Answer: D. Distillation

   Distillation separates components based on their boiling points, making it suitable for removing volatile impurities.

3. Which metal is extracted by the Mond process?

   1. Iron
   2. Nickel
   3. Copper
   4. Zinc
   Show answer

   Answer: B. Nickel

   The Mond process uses carbon monoxide to selectively extract nickel.

4. Explain the concept of self-reduction in the extraction of metals.

   1. Reduction using a metal below it in the activity series
   2. Reduction using an external reducing agent
   3. Reduction of a metal oxide by its own metal
   4. Reduction by heating in the presence of air
   Show answer

   Answer: C. Reduction of a metal oxide by its own metal

   Self-reduction happens when a metal is simultaneously oxidized and reduced, acting as both reducing and oxidizing agent.

5. What is the function of a collector in froth flotation?

   1. To increase the froth stability
   2. To make the ore particles hydrophobic
   3. To make the gangue particles hydrophilic
   4. To increase the density of ore particles
   Show answer

   Answer: B. To make the ore particles hydrophobic

   Collectors attach to the ore particles, making them hydrophobic and allowing them to attach to the air bubbles in the froth.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the primary reducing agent used in the extraction of iron from its ore?
2. Which process involves the concentration of ore by removing unwanted gangue particles using water?
3. What is the role of flux in the extraction of metals?
4. Explain the principle behind froth flotation.
5. What is the purpose of electrolytic refining?
6. Describe the process of zone refining.
7. Explain the Ellingham diagram and its significance in extractive metallurgy.
8. Discuss the thermodynamics and kinetics involved in the extraction of metals. How do these factors influence the choice of extraction method?
9. What is the difference between roasting and calcination?
10. What is the role of a depressant in froth flotation?
11. What is the significance of the Gibbs free energy change in the extraction of metals?
12. Which process is used to extract aluminium from bauxite?
13. How does the concentration of ore affect the extraction process?
14. What is liquation?
15. How does the position of a metal in the electrochemical series affect its extraction?
16. Discuss the environmental impact of metal extraction and methods for minimizing its negative effects.
17. What is the purpose of leaching in metallurgy?
18. Which type of ore is best suited for magnetic separation?
19. What is the difference between an ore and a mineral?
20. Why is carbon monoxide a good reducing agent in the extraction of iron?
21. What is the Bayer process used for?
22. What is the role of an activator in froth flotation?
23. What is the Bessemer process used for?
24. What is the difference between electrolytic and chemical refining?

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