" /> -->

Metallurgy - Two Marks Study Materials

12th Standard EM

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

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. What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

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

  5. Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

  6. Describe a method for refining nickel

  7. Name some elements that occur as native elements.

  8. Name the two steps involved in the extraction of crude metal

  9. What is Ellingham diagram? or
    What does Ellingham diagram represent?

  10. What is leaching?

  11. What is the role of silica in the extraction of copped? (or) 
    Describe the role of SiO2 in the extraction of Cu from Copper matte.

  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 from its oxide ores through reduction.

  14. What is calcination? Give example.

  15. Define roasting,

*****************************************

TN 12th Standard EM Chemistry free Online practice tests

Reviews & Comments about 12th Chemistry Metallurgy - Two Marks Study Materials

Write your Comment