Solid State MCQ Questions & Answers in Physical Chemistry | Chemistry
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21.
Which of the following point defects are shown by $$AgB{r_{\left( s \right)}}$$ crystals ?
(i) Schottky defect
(ii) Frenkel defect
(iii) Metal excess defect
(iv) Metal deficiency defect
A
(i) and (ii)
B
(iii) and (iv)
C
(i) and (iii)
D
(ii) and (iv)
Answer :
(i) and (ii)
Schottky and Frenkel defects are shown by $$AgB{r_{\left( s \right)}}$$ crystals.
22.
In a unit cell of $$BaC{l_2}$$ ( fluorite structure ), the coordination numbers of $$B{a^{2 + }}$$ and $$C{l^ - }\,ions$$ are respectively
A
4 and 4
B
4 and 8
C
8 and 4
D
4 and 6
Answer :
8 and 4
In fluorite structure, cations form $$ccp$$ structure and anions are present in all tetrahedral holes. Hence, coordination no. of $$B{a^{2 + }}\,ions = 8$$ and coordination no. of $$C{l^ - }\,ions = 4.$$
23.
The correct statement regarding $$Fâ$$ centre is
A
electrons are held in the voids of crystals.
B
$$F â$$ centre produces colour to the crystals.
C
conductivity of the crystal increases due to $$F â$$ centre.
D
All of these
Answer :
All of these
All the given statements are correct about $$F-$$ centres.
24.
Edge length of unit cell of chromium metal is $$287\,pm$$ with $$bcc$$ arrangement. The atomic radius is of the order
A
124.27$$\,pm$$
B
287$$\,pm$$
C
574$$\,pm$$
D
143.5$$\,pm$$
Answer :
124.27$$\,pm$$
$$\eqalign{
& {\text{In }}bcc\,\,{\text{lattice,}} \cr
& r = \frac{{\sqrt 3 }}{4}a \cr
& r = \frac{{1.732 \times 287}}{4} \cr
& r = 124.27\,pm \cr} $$
25.
Which of the following is true about the value of refractive index of quartz glass ?
A
Same in all directions
B
Different in different directions
C
Cannot be measured
D
Always zero
Answer :
Same in all directions
Quartz glass is amorphous solid i.e., isotropic in nature. Therefore, value of any physical property ( e.g., refractive index ) would be same along any direction.
26.
The ionic radii of $${X^ + }$$ and $${Y^ - }\,ions$$ are $$146$$ and $$216\,pm$$ respectively. The probable type of structure shown by it is
A
$$CsCl$$ type
B
Rock salt type
C
Zinc blende type
D
$$Ca{F_2}$$ type
Answer :
Rock salt type
The radius ratio $$\frac{{{r_ + }}}{{{r_ - }}} = \frac{{146}}{{216}} = 0.675$$
It lies between $$0.414 - 0.732.$$ Hence, it exhibits rock salt type structure.
27.
Among the following which is the best description of water in the solid phase?
A
Covalent solid
B
Molecular solid
C
Ionic solid
D
Network solid
Answer :
Molecular solid
Molecular solid is the best description of water in the solid phase. For example, ice
is hydrogen bonded molecular solid.
28.
The addition of arsenic to germanium makes the latter a
A
metallic conductor
B
intrinsic semiconductor
C
mixed conductor
D
extrinsic semiconductor
Answer :
extrinsic semiconductor
Extrinsic semiconductor.
29.
In $$CsCl$$ type structure, the co-ordination number of $$C{s^ + }$$ and $$C{l^ - }$$ respectively are
A
6, 6
B
6, 8
C
8, 8
D
8, 6
Answer :
8, 8
The coordination number is 8 : 8 for $$C{s^ + }$$ and $$C{l^ - }.$$
30.
Which of the following metal oxides is antiferromagnetic in nature?