The number of atoms in an $\mathrm{FCC}$ is:

Important Questions on Solid State

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 12

A substance ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$ crystallizes in a face-centred cubic ($\mathrm{FCC}$) lattice in which atoms $\text{'}\mathrm{A}\text{'}$ occupy each corner of the cube and atoms $\text{'}\mathrm{B}\text{'}$ occupy the centres of each face of the cube. Identify the correct composition of the substance ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$.

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 13

A substance ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$ crystallizes in a face-centred cubic $\left(\mathrm{FCC}\right)$ lattice in which atoms $\text{'}\mathrm{A}\text{'}$ occupy each corner of the cube and atoms $\text{'}\mathrm{B}\text{'}$ occupy the centres of each face of the cube. Identify the correct composition of the substance ${\mathrm{A}}_{\mathrm{x}}{\mathrm{B}}_{\mathrm{y}}$.

EASY

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 14

$\mathrm{MgO}$ exists in $\mathrm{NaCl}$ type lattice (rock salt structure). The number of the nearest neighbors of ${\mathrm{Mg}}^{2+}$ ions are

EASY

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 15

In a face-centred cubic lattice, a unit cell is shared equally by how many unit cells?

EASY

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 16

Iron crystallizes in several modifications. At about ${911}^{\mathrm{o}}\mathrm{C}$, the bcc $\text{'}\mathrm{\alpha }\text{'}$ form undergoes a transition to fcc $\text{'}\mathrm{\gamma }\text{'}$ form. If the distance between two nearest neighbours is the same in the two forms at the transition temperature, what is the ratio of the density of iron in fcc form $\left({\mathrm{\rho }}_2\right)$ to the iron in bcc form $\left({\mathrm{\rho }}_1\right)$ at the transition temperature?

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 17

The cubic unit cell of $\mathrm{Al}$ (molar mass $=27 \mathrm{g} {\mathrm{mol}}^{-1}$) has an edge length of $405 \mathrm{pm}$. Its density is $2.7 \mathrm{g} {\mathrm{cm}}^{-3}$. The cubic unit cell is

MEDIUM

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 18

An element (atomic mass $=100 \mathrm{g} {\mathrm{mol}}^{-1}$) having $\mathrm{bcc}$ structure has a unit cell edge $400 \mathrm{pm}$. The density of the element is

EASY

Chemistry

IMPORTANT

Chemistry Crash Course BITSAT>Chapter 15 - Solid State>Exercise 1>Q 19

The coordination number of octahedral void is