The packing fraction for a body centred cubic structure is

If r is the radius of an atom and a is an edge length of fcc unit cell, then

The ratio of packing efficiency in scc, bcc and fcc crystalline structures is

The correct sequence of the atomic layers in cubic close packing is

The major binding force in diamond is

The ratio of close packed atoms to octahedral holes in cubic packing is

A defect present in AgCl is

An ionic solid crystallises in bcc structure. If the ionic radii of cation and anion are 0.84 Å and 1.07 Å, the length of the body diagonal is

The type of defect in NaCl crystal will be

Schottky defects are observed in which solid among the following ?