E-PolyLearning

56. Molecule of methane contains four
a. hydrogen atoms
b. sulphur atoms
c. nitrogen atoms
d. oxygen atoms
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Answer: (a).hydrogen atoms

57. First spectrometer used to determine isotopes was
a. Aston's
b. Dempster's
c. Bohr's
d. Aloison's
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Answer: (a).Aston's

58. Number of isotopes of tin is
a. eleven
b. five
c. seven
d. three
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Answer: (a).eleven

59. Molecular ions are generated by passing
a. X rays
b. alpha particles
c. both a and b
d. atomic rays
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Answer: (c).both a and b

60. Isotopes of cadmium are
a. nine
b. seven
c. six
d. five
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Answer: (a).nine