Na₂O has antifluorite structure. In Na₂O, the coordination number of ${\mathrm{N}}^{{\mathrm{a}}^{+}}$ and ${\mathrm{O}}^{2^{-}}$ are respectively

1. 4,4

2. 6,6

3. 4,8

4. 8,8

AB Crystallises in a B.C.C lattice with edge length. a as 387 Pm. The distance between two oppositely charged ions in the lattice is

1. 300 Pm

2. 335 Pm

3. 250 Pm

4. 200 Pm

In calcium fluoride structure, the coordination numbers of calcium and fluoride ions respectively are

1. 6 and 8

2. 8 and 8

3. 4 and 8

4. 8 and 4

In a body-centred cubic arrangement, A ions occupy the centre while B ions occupy the corners of the cube. The formula of the solid is

1. AB

2. AB₂ 

3. A₂B

4. AB₃ 

If three elements A, B and C crystallized in cubic solid lattice with A atoms at corners, B atoms at cube centres and C atoms at the edges, the formula of the compound is

1. ABC

2. ABC₃ 

3. AB₃C

4. A₃B₂C₃ 

In a cubic unit cell, seven of the eight corners are occupied by atom A and having of faces are occupied of B. The general formula of the substance having this type structure would be

1. A₇B₁₄

2. A₁₄B₇

3. A₇B₂₄

4. A₉B₂₄

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