1. In crystal structure of sodium chloride, the arrangement of
\[Cl^{-}\] ions is
a) fcc
b) bcc
c) Both fcc and bcc
d) None of these
Explanation: Arrangement of Cl– ions is fcc in NaCl
2. The intermetallic compound LiAg crystallizes in cubic lattice
in which both lithium and silver have co-ordination number
of eight. The crystal class is
a) simple cubic
b) body centred cubic
c) face-centred cubic
d) None of these
Explanation: In bcc each atom has C. No. = 8
3. In the crystals of which of the following ionic compounds
would you expect maximum distance between the centres of
the cations and anions?
a) LiF
b) CsF
c) CsI
d) LiI
Explanation: In CsI since Cs+ and I– have largest size
4. Potassium crystallizes with a
a) body-centred cubic lattice
b) face-centred cubic lattice
c) simple cubic lattice
d) orthorhombic lattice
Explanation: Potassium crystallises in BCC lattice
5. The range of radius ratio (cationic to anionic) for an
octahedral arrangement of ions in an ionic solid is
a) 0 – 0.155
b) 0.155 – 0.225
c) 0.225 – 0.414
d) 0.414 – 0.732
Explanation: For octahedral r+ / r- = 0.414 – 0.732
6. The interionic distance for cesium chloride crystal will be
a) a
b) \[\frac{a}{2}\]
c) \[\frac{\sqrt{3}a}{2}\]
d) \[\frac{2a}{\sqrt{3}}\]
Explanation:
7. Which of the following has hcp crystal stucture?
a) NaCl
b) CaCl
c) Zn
d) RbCl
Explanation: Zn has hcp lattice
8.In the fluorite structure, the coordination number of \[Ca^{2+}\] ion
is :
a) 4
b) 6
c) 8
d) 3
Explanation: In fluorite structure the C.No. of Ca++ is 8.
9.For an ionic crystal of the general formula AX and coordination
number 6, the radius ratio value will be
a) greater than 0.73
b) between 0.73 and 0.41
c) between 0.41 & 0.22
d) Less than 0.22
Explanation:
10. In CsCl, if coordination number of \[Cs^{+}\] is 8, then coordination
number of \[Cl^{-}\] ion is :
a) 4
b) 6
c) 8
d) 12
Explanation: It is bcc hence, C. No. of each ion is 8.