# The phenomenon in which polar crystals on heating produce electricity is called:- 1. Pyro-electricity.2. Piezo-electricity.3. Ferro-electricity.4. Ferri-electricity.

Subtopic:  Magnetic Behaviour of an Element/Compound |
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Total volume of atoms present in a face centred cubic unit cell of a metal is -

(r is atomic radius)

1. 20/3 $\pi$r3

2. 24/3 $\pi$r3

3. 12/3 $\pi$r3

4. 16/3 $\pi$r3

Subtopic:  Voids, Radius Ratio & Coordination Number |
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Lithium borohydride (LiBH4), crystallizes in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are:- a = 6.81 Å , b = 4.43 Å, c = 7.17 Å. If the molar mass of LiBH4 is 21.76 g mol-1, then the density of the crystal is:-

1. 0.67 g cm-3

2. 0.58 g cm-3

3. 1.23 g cm-3

4. None of the above.

Subtopic:  Density & Packing Fraction |
57%
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The arrangement of Xions around A+ ion in solid AX is given in the figure (not drawn to scale).
If the radius of X is 250 pm, the radius of A+ is:

1. 104 pm

2. 125 pm

3. 183 pm

4. 57 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
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In an f.c.c. unit cell. atoms are numbered as shown below. The atoms not touching each other are (Atom numbered 3 is face centre of front face).

1. 3&4

2. 1&3

3. 1&2

4. 2&4

Subtopic:  Introduction & Crystal System |
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A solid has a bcc structure. If the distance of closest approach between the two atoms is 1.73 Å, then the edge length of the cell is:

1. 200 pm

2. $\sqrt{3}}{\sqrt{2}}$ pm

3. 142.2 pm

4. pm

Subtopic:  Density & Packing Fraction |
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Which is covalent solid?

1. Silicate

2. Diamond

3. Graphite

4. All of these

Subtopic:  Introduction & Crystal System |
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What type of crystal defects is indicated in the diagram given below?

1. Frenkel and Schottky defects

2. Schottky defect

3. Interstitial defect

4. Frenkel defect

Subtopic:  Imperfections in Solids & Semiconductors |
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The anions (A) form hexagonal closest packing and atoms (C) occupy only 2/3 of octahedral voids in it. The general formula of the compound is-
1. CA
2. CA2
3. C2A3
4. C3A2

Subtopic:  Density & Packing Fraction |
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The mass of a unit cell of CsCl corresponds to:-
1. 8Cs+ and Cl-
2. 1Cs+ and 6Cl-
3. 1Cs+ and 1Cl-
4. 4Cs+ and Cl-

Subtopic:  Introduction & Crystal System |
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