Solid state practice · Mixed difficulty

An example of a non-stoichiometric compound is

A pure crystalline substance, on being heated gradually, first forms a turbid looking liquid and then the turbidity completely disappears. This behavior is the characteristic of substances forming

The hardness of metals increases with increase in number of ……involved in metallic bonding.

A solid compound contains $X,Y$ and $Z$ atoms in a cubic lattice with $X$ atom occupying the corners. $Y$ atoms in the body centred positions and $Z$ atoms at the centres of faces of the unit cell. What is the empirical formula of the compound?

In the calcium fluoride structure, the coordination number of the cation and anion are respectively

A solid with high electrical and thermal conductivity from the following is :

The vacant space in BCC lattice unit cell is

The unit cell with crystallographic dimensions $a \ne b \ne c,\,\,\,\alpha = \gamma = {90^\mathrm{o}}$ and $\beta \ne {90^\mathrm{o}}$ is

p-type semiconductor is formed when germanium is doped with

What is common in HCP and FCC unit cell?

The number of atoms in 100 g of an fcc crystal with density $d = 10\mathrm{g/c}{\mathrm{m}^\mathrm{3}}$ and cell edge equal to 100 pm, is equal to

$\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ have the oxidation numbers of $+6,-2$ and $-1$ respectively, the possible molecular formula when these atoms combine will be:

In face centred cubic unit cell edge length is

The $ABAB.....$ packing and $ABCABC.....$ packing are respectively called

A cation is in the centre touches three anions.
Assume that the anions also touch each
other. The limiting radius ratio, $r^+ / r^-$ is

Given below are two statements.
Statement I Frenkel defects are vacancy as well as interstitial defects.
Statement II Frenkel defects leads to colour in ionic solids due to presence of F - centres.
Choose the most appropriate answer from the options given below.

Which of the following solid is non-crystalline solid

A metal $X$ crystallises in a face-centred cubic arrangement with the edge length $862 \mathrm{pm}$. What is the shortest separation of any two nuclei of the atom? $(\sqrt{2}=1.4)$

A solid compound XY has $NaCl$ structure. If the radius of the cation is $100pm$, the radius of the anion $\left( {{Y^ - }} \right)$ is

In a mixed oxide, ${O}^{2-}$ has fcc arrangement, univalent ${B}^{\oplus}$ is present in all octahedral voids and divalent $A^{2 \oplus}$ is present in $\frac{1}{4}$ th of tetrahedral voids, then formula of the oxide should be

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

Close packing is maximum in the crystal lattice of :

Statement-I: The close packing of atoms in cubic structure is in the order $\text{fcc} > \text{bcc} > \text{sc}.$

Statement-II : Packing efficiency $=\frac{\text {Volume occupied by atom in unit cell}}{\text {Total volume of the unit cell}}.$

A solid has a structure in which ${X}$ atoms are located at cubic corners of unit cell, ${O}$ atoms are at the edge centers and ${Y}$ atoms at cube centre. Then the formula of compound is ${X}_{{a}} {Y}_{{b}} {O}_{{c}}$. If two atoms of ${O}$ are missing from any of two edge centers per unit cell, then the molecular formula is ${X}_{{x}} {Y}_{{y}} {O}_z$. Then, find the value of $({x}+{y}+{z})-$ $(a+b+c)$.

The example of orthosilicate is :

In a fcc lattice $A, B, C$ and $D$ atoms are arranged at corners, face centres octahedral voids and half of tetrahedral voids respectively and if the crystal deposited is defected such that all the particles at one body diagonal of each unit cell are missing, correspondingly then what is the resulted formula of the compound?

A compound of formula ${A_2}{B_3}$ has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms?

With which one of the following elements silicon should be doped so as to give $P - type$ of semiconductor

Which is the incorrect statement?

The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is: