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TRB MODEL QUESTIONS FOR CHEMISTRY

TRB Model Questions
41. Carbon occurs in nature in the purest form as
 
  • A. Coal
  • B. Graphite
  • C. Diamond
  • D. Carbon black
 
42. Element which is an enemy of copper is
 
  • A. carbon
  • B. sulphur
  • C. nitrogen
  • D. chlorine
 
 
43. The number of shared pair of electrons present in nitrogen molecule is
 
  • A. One
  • B. Two
  • C. Three
  • D. Four
 
44. Vinegar is trade name of
 
  • A. Chloroform
  • B. Ethyl alcohol
  • C. Carbon tetrachloride
  • D. Acetic acid
 
45. The valency of magnesium is
 
  • A. One
  • B. Two
  • C. Three
  • D. Four