TEST PAPER 23 : CHAPTER 9 : SOME IMPORTANT CHEMICAL COMPOUNDS : 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. Steel is an alloy of ______.
   
   
   
   1. iron and silica
   2. iron and nickel
   3. iron and chromium
   4. iron and carbon
      
   
   
2. The formula of baking soda is ______.
   
   
   
   1. NaHCO₃
   2. Na₂CO₃.10H₂O
   3. Na₂CO₃
   4. Na₂SiO₃
      
   
   
3. ______ is used for making permanent magnets.
   
   
   
   1. Manganese steel
   2. Chromium steel
   3. Cobalt steel
   4. Silicon steel
      
   
   

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

4. What is the chemical name of washing soda ?
5. How much carbon does steel contain ?
6. What is the full form of RCC ?
   
   

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

7. Describe how bleaching powder is manufactured.
8. Mention four uses of lime.
9. Mention the composition of stainless steel and one important property.
10. Write a few points on coloured glass.
    
    

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

11. Describe ammonia soda process to manufacture washing soda.
12. Describe manufacture of glass.
    
    

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

13. Write a note on Plaster of Paris explaining its preparation, properties and uses.