## Question

### Solution

Correct option is

4

In Na2O, each oxide ions (O2-) is co – ordinate to 8Na+ ions and each Na+ ion to 4 oxide ions. Hence, it has 4: 8 coordination.

#### SIMILAR QUESTIONS

Q1

If the value of ionic radius ratio is 0.52 in an ionic compound, the geometrical arrangement of ions in crystal is

Q2

A metal has bcc structure and the edge length of its unit cell is 3.04 . The volume of the unit cell in cm3 will be

Q3

For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be

Q4

In A+ B- ionic compound, radii of A+ and B- ions are 180 pm and 187 pm respectively. The crystal structure of this compound will be

Q5

Sodium metal crystallizes as a body centred cubic lattice with the cell edge 4.29 . What is the radius of sodium atom?

Q6

An fcc lattice has a lattice parameter a = 400 pm. Calculate the molar volume of the lattice including all the empty space.

Q7

The structure of Na2O crystal is

Q8

Structure similar to zinc blende is found in

Q9

The number of equidistance oppositely charged ions in a sodium chloride crystal is

Q10

In zinc blende structure, the coordination number of Zn2+ ion is