Solid state practice · Medium

Under which category iodine crystals are placed among the following?

The limiting radius ratio for tetrahedral shape is

Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces?

The coordination number of Al in the crystalline state of $\mathrm{AlC}{\mathrm{l}_3}$ is

In a crystal of $\mathrm{NaCl}$, if all the ions along one of the body diagonal are removed then the simplest formula of the crystalline solid will be

If ‘a’ stands for the edge length of the cubic systems: Simple, Cubic, body centred cubic face centred cubic, then the ratio of radii of the spheres in these systems will be respectively.

In a face centred cubic arrangement off $A$ and $B$ atoms whose A atoms are at the corner of the unit cell and $B$ atoms at the face centres. One of the $A$ atom is missing from one corner in unit cell. The simplest formula of compound is :

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion $(C{a^{2 + }})$ and fluoride ion $({F^ - })$ are

A crystal is made up of metal ions ${M_1}$ and ${M_2}$ and oxide ions. Oxide ions form a ccp lattice structure. The cation ${M_1}$ occupies 50 % of octahedral voids and the cation ${M_2}$ occupies 12.5% of tetrahedral voids of oxide lattice. The oxidation numbers of ${M_1}$ and ${M_2}$ are, respectively

Frenkel defect is found in crystals in which the radius ration is

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason (R) : In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
In the light of the above statements, choose the most appropriate answer from the options given below

Which defect causes decreases in the density of crystal?

Certain crystals produces electric signals on application of pressure. This phenomena is called

At room temperature, sodium crystallizes in a body centered cubic lattice with $a = 4.24\mathop \mathrm{A}\limits^ \circ$. the theoretical density of sodium $\mathrm{(At}\mathrm{. wt}\mathrm{. Of\; Na} = 23)$ is :

Which of the following expressions is correct in case of a $\mathrm{CsCl}$ unit cell (edge length ' $a$ ')?

Crystalline metal can be transformed into metallic glass by:

Amorphous substances show (i) Short and long range order (ii) Short range order (iii) Long range order (iv) Have no sharp melting point

Solid ${CO}_2$ is an example of the crystal type -

X- ray analysis shows that the unit cell length in $\mathrm{NaCl}$ is 562.8 pm. Calculate the density you would expect on this basis, ${N_A} = 6.023\mathrm{x}{10^{23}}\mathrm{mo}{\mathrm{l}^{ - 1}}$

The closest distance between the centres of two molecules of a gas taking part in collision is called

Statement I: Frenkel defect involving the migration of ions to interstitial sites is more likely for covalent compounds and for large (and highly polarisable) anions.

Statement II: Large polarisable anions make it easier to accommodate the displaced cations and minimise repulsive effect.

Oxygen atom forms FCC unit cell with 'A' atoms occupying all tetrahedral voids and 'B' atoms occupying all octahedral voids. If atoms are removed from two of the body diagonals then determine the formula of resultant compound formed.

This one is amorphous –

Structure similar to zinc blende is found in

Which of the following is an example of ferrimagnetic substance?

Which of the following is ferroelectric compound?

Distance between nearest cation and anion in an ionic solid is $\frac{\sqrt{3} a}{4}$ then ionic solid may be:

The number of spheres contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is

An example of a non-stoichiometric compound is

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?