In a cubic closed packed structure of mixed oxides, the lattice is made up of oxide ions, 20% of tetrahedral Voids are occupied by divalent A²⁺ ions and 50% of the octahedral voids by trivalent B³⁺. The formula of the oxide is?

1. A₄B₅O₁₀

2. A₂B₅O₅

3. A₂BO

4. A₄B₅O₈ 

A compound formed by elements A and B crystallizes in cubic structure where A atoms are at the corners or a cube and B atoms are at the face centre. The formula of the compound is :

1. AB

2. AB₂

3. AB₃

4. AB₄

The radius of Ag⁺ ion is 126 pm while that of I^- ion is 216 pm. The coordination number of Ag in AgI is

1. 8

2. 6

3. 4

4. 2

Which of the following crystals have 6:6 coordination?

1. MnO

2. NH₄I

3. ZnS

4. none of these

TiO₂ (rutile) shows 6:3 coordination. The solid having rutile like structure among the following is

1. KCl

2. SnO₂

3. ZnS

4. none of these

A solid having unit cell made up of planes as shown in figure coordination number of 'X' is

1. 12

2. 10

3. 6

4. 4

A compound contains two types of atoms: X and Y. It crystallizes in a cubic lattice with atoms X at the corners of the unit cell and atoms Y at the body centres.

The simples possible formula of this compound is:

1. XY

2. X₂Y₂

3. XY₆

4. X₈Y

The edge length of the unit cell of NaCl crystal lattice is 552 pm. If the ionic radius of sodium ion is 95 pm. What is the ionic radius of chloride ion?

1. 181 pm

2. 190 pm

3. 276 pm

3. 368 pm

The second order Bragg diffraction of X-rays, with $\mathrm{\lambda }=1 \mathrm{\AA }$ from a set of parallel planes in a metal, occurs at an angle of $60°.$ The distance between the scattering planes in the crystal is

1. 2.00 Å

2. 1.00 Å

3. 0.575 Å

4. 1.15 Å

The closest distance between two atoms (in terms of edge length) would be highest for which of unit cell, assuming the edge length of each unit cell be 'a'

1. FCC unit cell

2. BCC unit cell

3. diamond unit cell

4. primitive cubic cell