E-PolyLearning

61. Phenomenon of isotopy was discovered by
a. Rutherford
b. Bohr
c. Soddy
d. Democritus
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Answer: (c).Soddy

62. Molecular formula is determined by multiplying n with
a. Molar mass
b. atomic number
c. atomic mass
d. empirical formula
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Answer: (d).empirical formula

63. Number of atoms or molecule present in one molar mass of an entity is known as
a. Bohr number
b. Mass number
c. Avogadro's number
d. Atomic number
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Answer: (c).Avogadro's number

64. Units by which hydrogen atom is lighter than hemoglobin is
a. 70000
b. 58000
c. 78000
d. 68000
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Answer: (d).68000

65. 1 atomic mass unit is equal to
a. 1.661x10-27
b. 1.665x10-23
c. 1.661x10-34
d. 1.661x10-21
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Answer: (a).1.661x10-27