Prof. Anil Thomas and Prof. Santosh Yadav Solutions for Chapter: Solid State, Exercise 2: Critical Thinking

At low temperature and high pressure, ${\text{SO}}_{\text{2}}$ freezes to form a crystalline solid. Which term best describes the solid?

Quartz is a crystalline variety of

The unit cell of a binary alloy of $\mathrm{A}$ and $\mathrm{B}$ metals has a $\mathrm{ccp}$ structure with $\mathrm{A}$ atoms occupying the corners and $\mathrm{B}$ atoms occupying the centres of each face of the cubic unit cell. If, during the crystallisation of this alloy in the unit cell, two $\mathrm{A}$ atoms are missed, the overall composition per unit cell is 

The CORRECT statement in the following is

In which of the following, the metals are CORRECTLY arranged in increasing order of packing efficiency?

Potassium fluoride has $\mathrm{NaCl}$ type structure. What is the distance between ${\mathrm{K}}^{\mathrm{+}} \text{and} {\mathrm{F}}^{\mathrm{-}}$ ions if cell edge is $\text{'}\mathrm{a}\text{'} \mathrm{cm}$?

Among the following, which crystal will be soft and has low melting point?

A certain metal crystallises in a simple cubic structure. At a certain temperature, it arranges to give a body-centred structure. In this transition, the density of the metal