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Chemistry

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16. Bleaching powder contains
 
  • A. nitrogen
  • B. iodine
  • C. chlorine
  • D. bromine
 
17. Which one of the following gases is readily soluble in water at room temperature?
 
  • A. chlorine
  • B. nitrogen
  • C. ammonia
  • D. carbon dioxide
 
 
18. Radon is
 
  • A. germon radio
  • B. inert gas
  • C. artificial fibre
  • D. an explosive
 
19. pH of water is
 
  • A. 4
  • B. 7
  • C. 12
  • D. 18
 
20. pH of blood is
 
  • A. 4
  • B. 6.4
  • C. 7.4
  • D. 8