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6. Who determined the atomic masses of elements?

  • Faraday
  • Berzelius
  • John Dalton
  • Mendeleeve

7. How many natural radioactive isotopes are there?

  • 87
  • 40
  • 24
  • 18

8. In combustion analysis, what absorbs H2O?

  • Mg(ClO4)2
  • K2CO3
  • KOH
  • NaOH

9. What value of potential difference is applied in a mass spectrometer?

  • 50-2000V
  • 50-20kV
  • 500-2000V
  • 500-2000eV

10. What is the smallest size that can be seen by an light microscope?

  • 500nm
  • 320nm
  • 740nm
  • 1000nm

11. Which of the following are positive ions?

  • Carbocations
  • N2+
  • Both NH4+ and Carbocations
  • NH4+

12. How many isotopes does carbon have?

  • 2
  • 3
  • 6
  • 5

13. In gaseous state, how many times is the distance between molecules greater than the diameter of the atoms?

  • 200
  • 300
  • 500
  • 100

14. How many isotopes does tin have?

  • 7
  • 12
  • 11
  • 4

15. Which sequence of events in a mass spectrometer is correct?

  • Volatilized->Ionized
  • Ionized->Volatilized

16. What is the amu of Cu?

  • 63.546
  • 63.098
  • 63.246
  • 63.001

17. Which elements make up 50% of the Earth's crust?

  • O, Fe, Mg, C and H
  • O, Mg, Si, Fe and H
  • O, Mg, Si, Ca and Fe
  • O, C, Mg, Si and Fe

18. What is the order of wavelengths of visible light?

  • Metre
  • Decimetre
  • Nanometre
  • Micrometre

19. How can the relative abundance of isotopes be determined?

  • NMR
  • Vapor density
  • Mass Spectrometry
  • Chromatography

20. How was the diameter of atoms determined?

  • Vapor density
  • NMR
  • X rays
  • Chromatography