Solid State

Solid State

Which of the following doesn’t crystallise in the rock-salt structure?

Q: Which of the following doesn’t crystallise in the rock-salt structure?

(A) NaCl

(B) KCl

(C) MgCl2

(D) CsCl

Ans: (D)

If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is sp3 what fractions of void are occupied by carbon atom.

Q: If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is sp3 what fractions of void are occupied by carbon atom.

(A) 25% Tetrahedral                          

(B) 50% Tetrahedral

(C) 25% Octahedral                           

(D) 50% Octahedral

Ans: (D)

KBr shows, which of the following defects ?

Q: KBr shows, which of the following defects ?

(A) Frenkel defect

(B) Schottky defect

(C) Metal excess defeat

(C) Metal deficiency

Ans: (B)

A face centre atom corner atom in the hexagonal unit cell structure is shared with

Q: A face centre atom corner atom in the hexagonal unit cell structure is shared with

(A) 4-unit cells                                    

(B) 3-unit cells

(C) 6-unit cells                                   

(D) None

Ans: (C)

The 8 : 8 type of packing is present in ?

Q: The 8 : 8 type of packing is present in ?

(A) CsCl                                             

(B) KCl

(C) NaCl                                             

(D) MgF2

Ans: (A)