Solid State Tes...

Fraction of empty space in ABAB type arrangement in 3D is :

The pyknometric density of sodium chloride crystal is $$2.165\times 10^{3}\ kg\ m^{-3}$$ while its X-ray density is $$2.178\times 10^{3} kg\ m^{-3}$$. The fraction of unoccupied sites in sodium chloride crystal is:

Statement 1: Increasing temperature increases the density of point defects.
Statement 2: The process of formation of point defects in solids is endothermic and has $$\Delta S > 0$$.

Iron occurs as bcc as well as fcc unit cell. If the effective radius of an atom of iron is $$124$$ pm, the density (in g cm$$^{-3}$$) of iron in both these structures are, respectively :

An element crystallizes in a structure having FCC unit cell of an edge length equal to $$200$$ pm. Calculate the density (in g cm$$^{-3}$$) if $$200$$ g of this element contains $$24\times10^{23}$$ atoms.

Gold crystallizes in a face centered cubic lattice. If the length of the edge of the unit cell is $$407$$ pm, calculate the density of gold as well as its atomic radius assuming it to be spherical. Atomic mass of gold $$=197$$ amu.

The face centred cubic cell of platinum has a length of $$0.392 nm$$. Calculate the density of platinum $$(g/cm^3): $$

The distance between an octahedral and tetrahedral void in fcc lattice would be

An element X (atomic weight $$= 24$$ amu) forms a face-centred cubic lattice. If the edge length of the lattice is $${4\times10^{- 8}}$$ cm and the observed density is $$2.40 \times 10^{3}$$ kg m$$^{-3}$$, then the percentage occupancy of lattice points by element X is: (use $$ {N_{A}= 6\times 10^{23}}$$)