In the unit cell of an fcc system the number of octahedral and tetrahedral holes are

(A) 4,4

(B) 4, 8

(C) 1, 8

(D) 4, 1

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High Yielding Test Series + Question Bank - NEET 2020

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Xenon crystallizes in face centre cubic lattice and edge of the unit cell is 620 pm, then the radius of Xenon atom is-

(A) 219.20 pm

(B) 438.5 pm

(C) 265.5 pm

(D) 536.94 pm

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The unit cell of a metallic element of atomic mass 108 and density 10.5 g/$c{m}^{2}$ is a cube with edge length of 409 pm. The structure of the crystal lattice is-

(A) fcc

(B) bcc

(C) hcp

(D) None of these

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Density/Formula/packing fraction/ Semiconductors
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What is the simplest formula of a solid whose cubic unit cell has the atom A at each corner, the atom B at each face centre and a C atom at the body centre-

(A) $A{B}_{2}C$

(B) ${A}_{2}BC$

(C) $A{B}_{3}C$

(C) $AB{C}_{3}$

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The unit cell dimensions of a cubic lattice (edges a, b, c and the angles between them,  ) are

(A) a=b=c, $\alpha =\beta =\gamma =90°$

(B) a=b$\ne$c, $\alpha =\beta =\gamma =90°$

(C) a=b=c,

(D) a$\ne$b$\ne$c,

Concept Questions :-

Introduction and Type of Crystal System
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The most efficient packing of similar spheres is obtained in

(A) the simple cubic system and the body centered cubic system

(B) the simple cubic system and the hexagonal close packed system

(C) the face centered cubic system and the hexagonal close packed system

(D) the body centered cubic system and the face centered cubic system

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
High Yielding Test Series + Question Bank - NEET 2020

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Copper metal has a face-centred cubic structure with the unit cell length equal to 0.361 nm. Picturing copper ions in contact along the face diagonal. The apparent radius of a copper ion is-

(A) 0.128

(B) 1.42

(C) 3.22

(D) 4.22

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Density/Formula/packing fraction/ Semiconductors
High Yielding Test Series + Question Bank - NEET 2020

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Choose the correct matching sequence from the possibilities given

(a) Crystal defect                             (1) AB AB AB.....type crystal

(b) hcp                                            (2) Covalent crystal

(c) CsCl                                           (3) Frenkel

(d) Diamond                                    (4) Face centered in cube

(e) NaCl                                          (5) Body centered in cube
(a)           (b)               (c)             (d)                   (e)

(A)           3               1                 2                5                     4

(B)           3               1                 5                2                     4

(C)           3               5                 1                2                     4

(D)           5               3                4                 2                     1

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Imperfections in Solids
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A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-

(A) AuCu

(B) $AuC{u}_{2}$

(C) $AuC{u}_{3}$

(D) None of these

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Density/Formula/packing fraction/ Semiconductors
High Yielding Test Series + Question Bank - NEET 2020

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Select the correct statement (s) -

(a) The C.N. of cation occupying a tetrahedral hole is 4.

(b) The C.N. of cation occupying a octahedral hole is 6.

(c) In schottky defects, density of the lattice decreases,

(A) a, b

(B) b, c

(C) a, b, c

(D) a, c

Concept Questions :-

Introduction and Type of Crystal System