Dr. H.C. Srivastava and SUMEDHA SRIVASTAVA Solutions for Chapter: Solid State, Exercise 5: OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTIONS

The number of atoms contained in one face-centred cubic unit cell of a monoatomic substance is

How many chloride ions are there around sodium ion in sodium chloride crystal?

For an ionic crystal of general formula $\mathrm{AX}$ and coordination number $6$, the value of radius ratio will be

The ionic radii of ${\mathrm{A}}^{+}$ and ${\mathrm{B}}^{-}$ ions are $0.96\times {10}^{-10} \mathrm{m}$ and $1.81\times {10}^{-10} \mathrm{m}$. The coordination number of each ion in $\mathrm{AB}$ is

Which is the incorrect statement?

A metal crystallises in a face-centred cubic structure. If the edge length of its unit call is '$\mathrm{a}$', the closest approach between two atoms in metallic crystal will be

Which type of 'defect' has the presence of cations in the interstitial sites?

Iron exhibits bcc structure at room temperature. Above $900 °\mathrm{C}$, it transforms to fcc structure. The ratio of density of iron at room temperature to that at $900 °\mathrm{C}$ (assuming molar mass and atomic radii of iron remains constant with temperature) is