Chemistry General Knowledge Questions and Answers

17. Which of the following electromagnetic wave has the longest wavelength?
  A.  Gamma rays
  B.  Ultra violet rays
  C.  Light rays
  D.  Infra red rays
Answer
Ans: D
Infra red rays
18. The boiling point of ethanol is
  A.  252 K
  B.  290 K
  C.  329 K
  D.  351 K
Answer
Ans: D
351 K
19. Which type of glass is used in telecommunications?
  A.  Pyrex glass
  B.  Flint glass
  C.  Optical fibres
  D.  Soda glass
Answer
Ans: C
Optical fibres
20. Bleaching powder is prepared by passing chlorine through
  A.  Quicklime
  B.  Dry slaked lime
  C.  Limestone
  D.  Milk of lime
Answer
Ans: B
Dry slaked lime
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