Seema Saini Solutions for Chapter: Solid State, Exercise 4: DPP 1.4

The $\mathrm{\gamma }$ -form of iron has FCC structure (edge length, $386 \mathrm{pm}$) and $\mathrm{\beta }$-form has BCC structure (edge length, $290 \mathrm{pm}$). The ratio of density in $\mathrm{\gamma }$ -form to that in $\mathrm{\beta }$-form is:

A non-stoichiometric compound, ${\mathrm{Cu}}_{1.8}\mathrm{S}$ is formed due to incorporation of ${\mathrm{Cu}}^{2+}$ ions in the lattice of cuprous sulphide. What is the percentage of ${\mathrm{Cu}}^{2+}$ ion in the total copper content in the compound?

A binary solid ($\mathrm{A}{}^{+}\mathrm{B}^{-}$) has a rock salt structure. If the edge length is $400 \mathrm{pm}$ and the radius of cation is $75 \mathrm{pm}$, what is the radius of anion?

For the unit cell of $\mathrm{NaCl}$, which of the following statements are correct?

In which of the following solids do cations occupy tetrahedral voids?

Which of the following is/are correct about $\mathrm{CsCl}$?

Sodium oxide, ${\mathrm{Na}}_2\mathrm{O}$ is a crystalline solid. It has

Select the correct statements among the following.