Metallurgy Two Marks Questions

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    15 x 2 = 30
  1. What is the difference between minerals and ores?

  2. What are the various steps involved in extraction of pure metals from their ores?

  3. Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

  4. Describe a method for refining nickel

  5. What is metallurgy?

  6. What is meant by concentration?

  7. Name some reducing agents used to convert Metal oxides to metal

  8. Name the metals that are obtained from their oxides using hydrogen as reducing agent.

  9. Discuss the process of roasting with suitable example.

  10. Write the two similarities between calcination and roasting.

  11. What is distillation?

  12. Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

  13. Give reason : Extraction of copper directly from sulphide ores is less favourable than that from its oxide ores through reduction.

  14. What are the different methods of concentration of ores?

  15. Define roasting,

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