Chemistry Quiz Questions and Answers

21. The colouring agent used in the preparation of brown coloured glass is
  A.  Chromic oxide
  B.  Cobalt oxide
  C.  Manganese dioxide
  D.  Ferric oxide
Answer
Ans: D
Ferric oxide
22. Which of the following is used in endoscopes?
  A.  Optical fibre
  B.  Safety glass
  C.  Glass wool
  D.  Flint glass
Answer
Ans: A
Optical fibre
23. A pungent smell often present near the urinals is due to
  A.  Chlorine
  B.  Ammonia
  C.  Sulphur dioxide
  D.  Urea
Answer
Ans: B
Ammonia
24. Blood cells do not shrink in blood because blood is
  A.  Equimolar
  B.  Isotonic
  C.  Hypotonic
  D.  Hypertonic
Answer
Ans: B
Isotonic
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