TEST PAPER 24 : CHAPTER 10 : METALS : 25 MARKS

There are 13 questions in all and time limit is 45 minutes.

SECTION - A : CHOOSE APPROPRIATE ALTERNATIVE : [1 mark each, Total marks 3]

1. Liquefaction method is used for the purification of metals with ______.
   
   
   
   1. high melting point
   2. low melting point
   3. high boiling point
   4. low boiling point
      
   
   
2. Pure gold is ______ carats.
   
   
   
   1. 20
   2. 22
   3. 24
   4. 100
      
   
   
3. The melting point of iron is ______ °C.
   
   
   
   1. 1539
   2. 1639
   3. 1739
   4. 1839
      
   
   

   SECTION - B : ANSWER IN SHORT : [1 mark each, Total marks 3]
   

4. Define : Ore.
5. What do we mean by metallurgy ?
6. What is rust chemically ?
   
   

   SECTION - C : ANSWER IN BRIEF : [2 marks each, Total marks 8]
   

7. Write a note on magnetic separation.
8. Explain calcination with example.
9. Explain the importance of ultrapure metals.
10. What is an alloy ? Give two examples.
    
    

    SECTION - D : ANSWER THE FOLLOWING : [3 marks each, Total marks 6]
    

11. Describe Bayer's process to obtain pure alumina from bauxite.
12. Describe reactions of metals with water giving proper chemical equations.
    
    

    SECTION - E : ANSWER IN DETAIL : [5 marks each, Total marks 5]
    

13. Mention two ores of iron and write their formulae. Describe the manufacture of iron using blast furnace(diagram not essential).