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1. The major ingredient of leather is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
2. The percentage of nickel in nickel alloy for making radio valves is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
3. Glacial acetic acid contains
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
4. The ore of mercury is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
5. The elements present in zero group are called
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
6. Which of the following gases is used for refrigeration?
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
7. The firstly synthesized organic compound in the laboratory is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
8. A mixture of naphthalene and sand separated by
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
9. Oxides of non metals are
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
10. The setting of plaster of paris takes place due to
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
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