Embibe Experts Solutions for Chapter: Solid State, Exercise 1: TS EAMCET - 5 August 2021 Shift 2

What are two types of crystal structures shown by ice at different pressures?

$\mathrm{NaCl}$ is a $\mathrm{FCC}$ lattice where ${\mathrm{Na}}^{+}$ ions are at corner and face centre positions. Chloride ions are at edge centres and body centre positions. How many $\mathrm{NaCl}$ formula units will be in an unit cell

A compound is formed by elements of $\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$. Atoms of $\mathrm{Z}$ (anions) make $\mathrm{FCC}$ lattice. Atoms of $\mathrm{X}$ (cations) occupy all the octahedral voids. Atoms of $\mathrm{Y}$ (cations) occupy $\frac{1}{3}\mathrm{rd}$ of the tetrahedral voids. The formula of the compound is:

Potassium crystallizes in $\mathrm{FCC}$ lattice with unit cell length of $0.5 \mathrm{nm}.$ The approximate density $\left(in{\mathrm{gcm}}^{-3}\right),$ if it contains $0.1\%$ Schottky defects is

The fraction of the total volume occupied by the atoms in a simple cube is

A compound made up of elements $\mathrm{A}$ and $\mathrm{B}$ (with a general formula ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$), where $\mathrm{B}$ form a hcp lattice and A occupy$2/3^{\mathrm{rd}}$ of the tetrahedral voids. The formula of the compound is

The number of voids in $1$ mole of a compounds forming a $\mathrm{hcp}$ structure are

${\mathrm{LiCoO}}_2$ crystallizes in a rhombohedral structure. Consider a situation where $50\%$ lithium $\left(\mathrm{Li}\right)$ is extracted from the lattice. To keep the crystal electrically neutral. change in average oxidation state of $\mathrm{Co}$ is