E-PolyLearning

46. Melting and boiling points of ionic crystals are usually
a. high
b. low
c. moderate
d. very low
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Answer: (a).high

47. In crystal lattice ions are arranged in
a. two dimensions
b. four dimensions
c. three dimensions
d. single dimension
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Answer: (c).three dimensions

48. Covalent crystalline solids are soluble in
a. polar solvents
b. non polar solvents
c. water
d. Normal saline
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Answer: (b).non polar solvents

49. Anisotropic properties shows variation in
a. chemical properties
b. physical properties
c. virtual properties
d. general properties
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Answer: (b).physical properties

50. Bond angle in structure of diamond is
a. 109.5 degree
b. 210 degree
c. 154 degree
d. 190 degree
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Answer: (a).109.5 degree