E-PolyLearning

11. Number of isotopes which oxygen atom has, are
a. three
b. five
c. nine
d. two
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Answer: (a).three

12. C₃H₄O₃ is empirical formula for vitamin
a. C
b. A
c. B
d. D
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Answer: (a).C

13. Moleis defined as mass of an element divided by
a. Molar mass
b. atomic number
c. atomic mass
d. empirical formula
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Answer: (a).Molar mass

14. Ordinary microscope can measure up to
a. 400nm
b. 500nm
c. 200nm
d. 700nm
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Answer: (b).500nm

15. Molecules expressed by formula unit mass are
a. atoms
b. neutral gases
c. covalent
d. ionic
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Answer: (d).ionic

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