E-PolyLearning

31. Most abundant molecular ions are
a. Anions
b. Cations
c. Neutral ions
d. Sulphur ions
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Answer: (b).Cations

32. Elements with even number of isotopes are
a. 156
b. 154
c. 153
d. 152
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Answer: (b).154

33. In accelerating chamber of mass spectrometer potential difference is
a. 500-2000
b. 600-7000
c. 300-8000
d. 700-9000
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Answer: (a).500-2000

34. Isotopes have same
a. atomic mass
b. atomic number
c. molecules
d. atoms
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Answer: (b).atomic number

35. Instrument use to measure exact 'atomic masses' is
a. Mass spectrometer
b. spectrometer
c. nanometer
d. both a and b
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Answer: (a).Mass spectrometer