Answers are given in the end of questions.
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Which one of the following is non-crystalline or amorphous?
(a) Diamond
(b) Graphite
(c) Glass
(d) Common Salt
The crystal with metal deficiency defect is
(a) NaCl
(b) FeO
(c) KCl
(d) ZnO
Which type of defect has the presence of cations in the interstitials sites?
(a) Schottky defect
(b) Vacancy defect
(c) Frenkel defect
(d) Metal deficiency defect
NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying
(a) high temperature
(b) high pressure
(c) high temperature and high pressure
(d) low temperature and low pressure
Which of the following metal oxides is antiferromagnetic in nature?
(a) MnO2
(b) TiO2
(c) VO2
(d) CrO2
An element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is
(a) 10.37 g cm-3
(b)2.14 g cm-3 (c) 7.29 g cm-3
(d) 5.19 g cm-3
Alkali halids do not show Frenkel defect because
(a) cations and anions have almost equal size
(b) there is a large difference in size of cations and anions
(c) cations and anions have low coordination number
(d) anions cannot be accommodated in voids
Which of the following compound is metallic and ferromagnetic?
(a) CrO2
(b) VO2
(c) MnO2
(d) TiO2
Which one of the following is a molecular crystal?
(a) Rock salt
(b) Quartz
(c) Dry ice
(d) Diamond
The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be
(a) 10 g cm-3
(b) 14.2 g cm-3
(c) 6.15 g cm-3
(d) 9.3 2 g cm-3
Answer:-
(c) Glass
(b) FeO
(c) Frenkel defect
(b) high pressure
(a) cations and anions have almost equal size
(a) CrO2
(a) MnO2
(d) 5.19 g cm-3
(c) Dry ice
(c) 6.15 g cm-3
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