At room temperature, sodium crystallises in a body centred cubic cell with a 4.24 A0. The theoretical density of sodium is- (Atomic mass of sodium=23.0 g mol-1)

(A) 2.05 g cm-3                                         

(B) 3.45 g cm-3

(C) 1.00 g cm-3                                         

(D) 3.55 g cm-3

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which is amorphous solids-

(A) Rubber                                       

(B) Plastic

(C) Glass                                         

(D) All

Concept Questions :-

Introduction and Type of Crystal System
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

Voids and radius ratio/coordination number
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

Voids and radius ratio/coordination number
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The unit cell of a metallic element of atomic mass 108 and density 10.5 g/cm2 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

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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) AB2C                                         

(B) A2BC

(C) AB3C                                         

(C) ABC3

Concept Questions :-

Voids and radius ratio/coordination number
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

(A) a=b=c, α=β=γ=90°

(B) a=bc, α=β=γ=90°

(C) a=b=c, α=γ=90°, β90°

(D) abc, α=β=90°, γ90°

Concept Questions :-

Introduction and Type of Crystal System
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


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

Concept Questions :-

Imperfections in Solids
To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: