E-PolyLearning

36. Accurate method of studying of Avogadro's number is study of
a. crystalline solids
b. metallic solids
c. non metallic solids
d. molecules
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Answer: (a).crystalline solids

37. Liquid crystals are usually composed of
a. circular molecules
b. rod like molecules
c. oval molecules
d. triangular molecules
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Answer: (b).rod like molecules

38. Angle in cubic system between edges is
a. 90 degree
b. 60 degree Celsius
c. 57 degree
d. 40 degree
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Answer: (a).90 degree

39. Another name for rhombohedral system is
a. trigonal system
b. monoclinic system
c. rhombic system
d. hexagonal system
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Answer: (a).trigonal system

40. Lattice energy is decreased when size of anion is
a. decreased
b. increased
c. remains same
d. no change
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Answer: (b).increased