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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?
8. In combustion analysis, what absorbs H2O?
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?
11. Which of the following are positive ions?
- Carbocations
- N2+
- Both NH4+ and Carbocations
- NH4+
12. How many isotopes does carbon have?
13. In gaseous state, how many times is the distance between molecules greater than the diameter of the atoms?
14. How many isotopes does tin have?
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