E-PolyLearning

61. When size of cation is increased lattice energy is
a. decreased
b. increased
c. remains same
d. converted
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Answer: (a).decreased

62. Six parameters which help to determine unit cell are
a. unit cell dimensions
b. unit cell lines
c. array
d. group
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Answer: (a).unit cell dimensions

63. In ionic solids repulsion between layers can be developed by
a. high force
b. small force
c. very little force
d. very high force
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Answer: (b).small force

64. Phase changes are usually
a. endothermic
b. exothermic
c. high energy
d. high pressure
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Answer: (a).endothermic

65. In covalent bonds electrons are shared
a. independently
b. by force
c. mutually
d. by temperature
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Answer: (c).mutually