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.

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
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   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
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   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
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   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
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   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
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   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.

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