E-PolyLearning

41. Symbol of Gold has been derived from its Latin name
a. Argentum
b. Argon
c. Aurum
d. Augmenten
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Answer: (c).Aurum

42. Valency is numerically equal to
a. the charge of an ion
b. the combining power of an atom
c. the combining power of a radical
d. all of these
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Answer: (d).all of these

43. Chemical formula of calcium nitrate is
a. CNOH
b. Ca(NO₃)₂
c. CaNO₃
d. CaNO₃
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Answer: (b).Ca(NO₃)₂

44. In Na₂CO₃, relative atomic mass of Oxygen is
a. 12
b. 24
c. 36
d. 48
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Answer: (d).48

45. If atomic mass of copper is 63.546, mass percent of copper in Cu₂O will be
a. 0.7898
b. 0.8098
c. 0.8882
d. 0.8678
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Answer: (c).0.8882