## Question

### Solution

Correct option is

Face centred cubic

we know that,

= 3.9 = 4

Face centred cubic unit cell contains 4 atom per unit cell, therefore, the given unit cell is face centred cubic unit cell.

#### SIMILAR QUESTIONS

Q1

MgO has a structure of NaCl, the coordination number of O2– in MgO is

Q2

If NaCl is doped with 10–3 mol% of SrCl2, calculate the concentration of cation vacancies

Q3

The composition of a sample of wustite is Fe0.93 O. What percentage of the iron is present in the form of  Fe III?

Q4

The first order reflection of a beam of  X – rays of wavelength  from the (210) plane of a crystal of the simple cubic type, occurs at an angle of 11.290, the length of the unit cell is

Q5

A solid AB has the NaCI structure. If radius of cation A+ is 120 pm, the maximum possible value of the radius of the anion B- is

Q6

CsCl crystallizes in a cubic lattice that has a Cl- at each corner and Cs+ at the centre of the unit cell. What is the value of edge length a of the cube?

Q7

KCI crystallises in the same type of lattice as does NaCI.

The ratio of the side of the unit cell for NaCI to that for KCI is

Q8

A binary solid X+ Y- has a zinc blende structure with Y- ions forming the lattice and X+ ion occupying 25% tetrahedral sites. The formula of the solid is

Q9

Gold (at wt. 197g mol-1) crystallises is a cubic closest packed structures (the face – centred cubic) and has a density of 19.3g/cm2. Its atomic radius is

Q10

Calcium metal crystallizes in fcc lattice with edge length 556 pm. Calculate the density (in g cm-3) of metal if it contains 0.2% Schottky defects.