## Question

### Solution

Correct option is

2a pm

Length of the edge of NaCl unit cell, = 2 × distance between Na+ and Cl-

#### SIMILAR QUESTIONS

Q1

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

Q2

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

Q3

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.

Q4

Which of the following statements about amorphous solids is incorrect?

Q5

An alloy of Cu, Ag and Au is found to have Cu forming the simple cubic closed packed lattice. If the Ag atoms occupy the face centres and Au is present at the body centre, the formula of the alloy will be

Q6

If the radius ratio is in the range of 0.414 – 0.732, then the coordination number will be

Q7

Quartz is a crystalline variety of

Q8

X – ray analysis shows that the unit cell length in NaCl is 562.8 pm. Calculate the density you would expect on this basis,

NA = 6.023 × 1023 mol-1.

Q9

A crystalline solid

Q10

The three states of matter are solid, liquid and gas. Which of the following statement is/are true about them?