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TRB MODEL QUESTIONS FOR CHEMISTRY

TRB Model Questions
31. Which of the following is an example of Metalloid?
 
  • A. Oxygen
  • B. Copper
  • C. Antimony
  • D. None of these
 
32. The gas liberated when zinc reacts with dilute H2SO4 is
 
  • A. SO2
  • B. SO3
  • C. H2
  • D. O2
 
 
33. The percentage of oxygen in NaOH is
 
  • A. 16
  • B. 32
  • C. 40
  • D. 48
 
34. The Law of constant composition was discovered by
 
  • A. Lavoisier
  • B. Dalton
  • C. Proust
  • D. None of these
 
35. Gobar gas mainly contains
 
  • A. Methane
  • B. Carbon dioxide
  • C. Hydrogen sulphide
  • D. Carbon monoxide