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TRB MODEL QUESTIONS FOR CHEMISTRY

TRB Model Questions
26. Crude petroleum is refined by
 
  • A. Distillation
  • B. Fractional distillation
  • C. Fractional crystallization
  • D. None of these
 
27. Vapour density of pure ozone is
 
  • A. 16
  • B. 24
  • C. 32
  • D. 48
 
 
28. Which of the following is not a homogenous mixture?
 
  • A. Smoke
  • B. Petrol
  • C. Air
  • D. Brass
 
29. The valency of bicarbonate ion is
 
  • A. 1
  • B. 2
  • C. 3
  • D. 4
 
30. The valency of sulphate ion is
 
  • A. 1
  • B. 2
  • C. 3
  • D. 4