Question 1

In a solid lattice, the cation has left a lattice site and is located at an interstitial position, the lattice defect is :

Accepted Answer

Frenkel defect is due to dislocation of ion from its usual lattice site to interstitial position.

Question 2

Frenkel and Schottky defects are :

Accepted Answer

Frenkel and Schottky defects are crystal defects. It arises due to dislodgement of cation or anion from their places in the crystal lattice.

Question 3

Which compound has antifluorite structure?

Accepted Answer

Anti-fluorite structure refers to an anion array with tetrahedral cations and the compound having A_2 B formula have anti-fluorite structure. So, Na _2 O has an anti-fluorite structure in which Na ^ + ions occupy all the tetrahedral voids and O ^ 2- occupy half of the cubic holes.

Question 4

Element 'B' forms ccp structure and 'A' 'occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is :

Accepted Answer

No. of lattice points = No. of octahedral voids = 1 2 No. of tetrahedral voids in c c p structure No. of atoms of B=4 No. of atoms of A= 1 2 No. of octahedral voids = 1 2 4=2 No. of atoms of O= All tetrahedral voids =2 No. of lattice points =2 4=8 Hence, A: B: O=1: 2: 4 Therefore, the formula of the compound is A B_ 2 O_ 4

Question 5

In a monoclinic unit cell, the relation of sides and angles are respectively:

Accepted Answer

No Solution

Solid State — Previous Year Questions & Solutions