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Chemistry

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41. Human bone does not contain
 
  • A. calcium
  • B. carbon
  • C. oxygen
  • D. phosphorous
 
42. Homo nuclear molecules contain
 
  • A. polar bond
  • B. covalent bond
  • C. ionic bond
  • D. coordinate bond
 
 
43. Normal valency of nitrogen is
 
  • A. 2
  • B. 3
  • C. 4
  • D. 5
 
44. The isotope atoms differ in
 
  • A. atomic number
  • B. number of protons
  • C. number of electrons
  • D. atomic weight
 
45. Nucleus of an atom contains
 
  • A. electrons
  • B. protons
  • C. electrons and protons
  • D. protons and neutrons