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Chemistry Questions and Answers

General Science
9. Which one of the following is used in softening of hard water?
 
  • A. backing soda
  • B. plaster of paris
  • C. washing soda
  • D. bleaching powder
 
 
10. The colouring agent is used to get ruby red colour glass is
 
  • A. chromic oxide
  • B. manganese oxide
  • C. cadmium sulphide
  • D. selenium sulphide
 
11. Calamine is the ore of
 
  • A. copper
  • B. zinc
  • C. silver
  • D. aluminium
 
12. When aluminium reacts with alkalis, the gas liberated is
 
  • A. chlorine
  • B. nitrogen
  • C. hydrogen
  • D. oxygen