Metallurgy Quiz - ICSE Class 10 Chemistry

Free practice quiz: Metallurgy (ICSE Class 10 Chemistry). 45 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 10 Chemistry practice quiz has 45 multiple-choice questions on Metallurgy, and 45 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 of the following processes is NOT used for the extraction of highly electropositive metals like sodium?

   1. Electrolytic reduction of fused salts
   2. Thermal decomposition of their oxides
   3. Electrolysis of molten chlorides
   4. Electrolysis of aqueous solutions
   Show answer

   Answer: D. Electrolysis of aqueous solutions

   Highly electropositive metals like sodium cannot be extracted by electrolysis of their aqueous solutions because water itself is more easily reduced than the metal ions. Electrolysis of fused salts or molten chlorides, or thermal decomposition of their oxides (in certain cases, though less common for sodium), are preferred methods.

2. Which of the following is NOT an example of amphoteric oxide, which can react with both acids and bases?

   1. Al2O3
   2. ZnO
   3. PbO
   4. MgO
   Show answer

   Answer: D. MgO

   Amphoteric oxides are those that react with both acids and bases. Aluminium oxide (Al2O3), zinc oxide (ZnO), and lead(II) oxide (PbO) are amphoteric. Magnesium oxide (MgO) is a basic oxide and reacts with acids but not with bases.

3. Anode mud in the electrolytic refining of copper contains:

   1. More reactive metals like zinc
   2. Less reactive metals like silver, gold, and platinum
   3. Copper oxides
   4. Impurities like sulphur and nitrogen
   Show answer

   Answer: B. Less reactive metals like silver, gold, and platinum

   During electrolytic refining of copper, the impure copper acts as the anode, and a thin strip of pure copper acts as the cathode. Impurities like zinc and iron, being more electropositive than copper, get oxidized and dissolve in the electrolyte. Less electropositive impurities like silver, gold, and platinum do not get oxidized and settle down at the bottom of the cell as anode mud, which is a valuable source of these metals.

4. The process of refining a metal by heating it to its melting point and then cooling it, allowing the impurities to settle down, is known as:

   1. Liquation
   2. Distillation
   3. Smelting
   4. Electrolysis
   Show answer

   Answer: A. Liquation

   Liquation is a refining process used for metals that have a low melting point and do not oxidize easily. The impure metal is melted on a sloping surface. The molten metal flows down, leaving behind the non-volatile impurities, while the metal oxidizes in the air if it's a reactive metal. However, the basic principle is melting and separation based on melting points.

5. In the extraction of aluminium by the Hall-Héroult process, the electrolyte is a mixture of molten cryolite and alumina. The purpose of cryolite is to:

   1. Act as a reducing agent
   2. Increase the melting point of alumina
   3. Decrease the melting point of alumina and increase its conductivity
   4. Act as a flux to remove impurities
   Show answer

   Answer: C. Decrease the melting point of alumina and increase its conductivity

   Alumina (Al2O3) melts at a very high temperature (over 2000°C). Cryolite (Na3AlF6) acts as a solvent for alumina and forms a molten mixture with a significantly lower melting point (around 900-1000°C). It also increases the electrical conductivity of the mixture, making electrolysis economically viable.

More questions in this quiz

Answers and explanations are in the full quiz.

1. In the froth flotation process for the concentration of sulphide ores, the frothing agent is used to:
2. The compound formed during the smelting of iron in a blast furnace which floats on the molten metal and is removed is:
3. Which of the following methods is most suitable for refining copper if it contains impurities like zinc, silver, and gold?
4. Thermite reaction is an exothermic reaction used for welding. The reactants involved are:
5. Galvanization is a process of coating iron with a layer of:
6. Which of the following ores is concentrated by the leaching process using a dilute solution of sodium cyanide?
7. The metal M is extracted by the electrolysis of its molten oxide. During electrolysis, the metal M is deposited at the cathode. The oxide of M is likely to be:
8. In the blast furnace, coke serves the primary purpose of:
9. The process used to convert a metal carbonate ore into its metal oxide by heating in the absence of air is called:
10. In electrolytic refining of copper, the electrolyte used is:
11. The substance added to the ore in the smelting process to remove acidic impurities is called a:
12. Which of the following metals is extracted by electrolysis of its molten chloride?
13. The principle behind the purification of 'blister copper' is:
14. In the Bayer's process for the extraction of Aluminium, Aluminium oxide is dissolved in a hot solution of:
15. Which of the following metals is extracted by the reduction of its oxide by aluminium powder?
16. The process of heating the sulphide ores in the presence of excess air to convert them into metal oxides is called:
17. The substance that removes fluxing agent's effect is called:
18. The electrolytic reduction of alumina for aluminium extraction is carried out in the presence of:
19. Corrosion of iron is an example of:
20. The mercury ore, cinnabar (HgS), is converted to mercury metal by:
21. A depressant in the froth flotation process is used to:
22. The process of heating a metal oxide with a reducing agent in a furnace to obtain the molten metal is called:
23. Which metal is obtained by the electrolytic reduction of its fused chloride?
24. Electrolytic refining of impure metals involves using the impure metal as:
25. Which of the following oxides is typically reduced by carbon monoxide in the blast furnace?
26. The chemical agent used to make the ore particles hydrophobic in froth flotation is:
27. When zinc blende (ZnS) is heated in excess air, the product formed is:
28. The process of heating a carbonate ore in the absence of air to form metal oxide is called:
29. In the electrolytic refining of aluminium, the anode is made of graphite and the cathode is made of:
30. Thermite welding is used to weld:
31. Which of the following is NOT a method for preventing corrosion of iron?
32. The metal obtained by the fractional distillation of mercury is:
33. The substance added to the ore in the smelting process that reacts with impurities to form slag is called:
34. The compound formed when silica impurity reacts with limestone in the blast furnace is:
35. The process used to extract highly electropositive metals from their molten salts by passing electric current is known as:
36. Which of the following metals is refined by zone refining?
37. The main ore of Aluminium is:
38. In the Bessemer process for the production of steel, the main purpose of blowing air through molten pig iron is to:
39. The chemical compound that is added to the ore during the smelting of iron to remove the acidic impurities is:
40. Which of the following is an example of a metal that is extracted by hydrometallurgy?

More quizzes

• Mole Concept & Stoichiometry▶ Play
• Mole Concept and Stoichiometry▶ Play
• Organic Chemistry▶ Play
• Periodic Properties & Variations▶ Play
• Periodic Table, Periodic Properties and Variations of Properties▶ Play
• Study of Compounds – Ammonia▶ Play

Browse all Chemistry quizzes

More to play