E-PolyLearning

36. John Dalton evidenced existence of atoms in
a. 1808
b. 1898
c. 1838
d. 1856
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Answer: (a).1808

37. Instrument use to collect ions is
a. Electrometer
b. ionizer
c. spectrometer
d. nanometer
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Answer: (a).Electrometer

38. Atomic mass of phosphorus is
a. 11
b. 21
c. 31
d. 41
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Answer: (c).31

39. Gas molecules differ in their diameters from distance by
a. 400
b. 300
c. 600
d. 500
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Answer: (b).300

40. Theoretical yield is decreased by
a. distillation
b. reaction
c. weighing
d. reactants
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Answer: (a).distillation