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

Sodium metal crystallizes in a body centred cubic lattice with unit cell edge length of \( 4 \, \mathring{\text{A}}\). The radius of sodium atom is ________ \( 10^{-1} \, \mathring{\text{A}} \) (Nearest integer)

Iron oxide \( \mathrm{FeO} \), crystallises in a cubic lattice with a unit cell edge length of \( 5.0 Å\). If density of the \( \mathrm{FeO} \) in the crystal is \( 4.0 \, \mathrm{g\,cm^{-3}} \), then the number of \( \mathrm{FeO} \) units present per unit cell is ________ (Nearest integer) (Given: Molar mass of Fe and O is \( 56 \) and \( 16 \, \mathrm{g\,mol^{-1}} \) respectively)

A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an:

In a binary compound, atoms of element A form a hcp structure and those of element M occupy \( \frac{2}{3} \) of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

Select the correct statements.
A. Crystalline solids have long range order.
B. Crystalline solids are istropic.
C. Amorphous solids are sometimes called pseudo solids.
D. Amorphous solids soften over a range of temperatures.
E. Amorphous solids have a definite heat of fusion.
Choose the most appropriate answer from the options given below :

Metal M crystallizes into a fcc lattice with the edge length \( 4.0 \times 10^{-8} \, \text{cm} \). The atomic mass of the metal is ________ \( \text{g/mol} \). (Nearest integer)
(Use: \( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \), density of metal, \( M = 9.03 \, \text{g} \, \text{cm}^{-3} \))

Given below are two statements:
Statement I: \( \mathrm{O_2}, \mathrm{Cu}^{2+} \) and \( \mathrm{Fe}^{3-} \) are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field.
Statement II: \( \mathrm{NaCl} \) and \( \mathrm{H_2O} \) are weakly magnetized in opposite direction to magnetic field.
In the light of the above statements, choose the most appropriate answer from the option given below:

Which of the following represents the lattice structures of \( A_{0.95}O \) containing \( A^{2+} \), \( A^{3+} \) and \( O^{2-} \) ions?

An element \( M \) crystallises in a body centred cubic unit cell with a cell edge of \( 300 \, \text{pm} \). The density of the element is \( 6.0 \, \text{g} \, \text{cm}^{-3} \). The number of atoms present in \( 180 \, \text{g} \) of the element is ________ \( \times 10^{23} \). (Nearest integer)

' \( x \) ' \( \text{g} \) of molecular oxygen (\( \text{O\(_2\)} \)) is mixed with \( 200 \, \text{g} \) of neon (\( \text{Ne} \)). The total pressure of the non-reactive mixture of \( \text{O\(_2\)} \) and \( \text{Ne} \) in the cylinder is \( 25 \, \text{bar} \). The partial pressure of \( \text{Ne} \) is \( 20 \, \text{bar} \) at the same temperature and volume. The value of ' \( x \) ' is ________.
[Given: Molar mass of \( \text{O\(_2\)} = 32 \, \text{g mol}^{-1} \). Molar mass of \( \text{Ne} = 20 \, \text{g mol}^{-1} \)]

Ionic radii of cation \( A^{+} \) and anion \( B^{-} \) are \( 102 \) and \( 181 \) \( \mathrm{pm} \) respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for \( B^{-} \). \( A^{+} \) is present in all octahedral voids. The edge length of the unit cell of the crystal \( \mathrm{AB} \) is __________ \( \mathrm{pm} \). (Nearest Integer)

The correct relationships between unit cell edge length '\( a \)' and radius of sphere '\( r \)' for face-centred and body–centred cubic structures respectively are:

A copper complex crystallising in a CCP lattice with a cell edge of \( 0.4518 \, \text{nm} \) has been revealed employing X-ray diffraction studies. The density of a copper complex is found to be \( 7.62 \, \text{g cm}^{-3} \). The molar mass of copper complex is ______ \( \text{g mol}^{-1} \). (Nearest integer)
[Given: \( N_a = 6.022 \times 10^{23} \, \text{mol}^{-1} \)]

Given below are two statements. One is labeled as Assertion A and the other is labelled as Reason R.
Assertion A: Sharp glass edge becomes smooth on heating it upto its melting point.
Reason R: The viscosity of glass decrease on melting.
Choose the most appropriate answer from the options given below.

A metal \( \mathrm{M} \) forms hexagonal close-packed structure. The total number of voids in \( 0.02 \) mol of it is ______ \( \times 10^{21} \) (Nearest integer).
(Given \( N_A = 6.02 \times 10^{23} \) )

The distance between \( \text{Na}^+ \) and \( \text{Cl}^- \) ions in solid \( \text{NaCl} \) of density \( 43.1 \, \text{g}\,\text{cm}^{-3} \) is __________ \( \times 10^{-10} \, \text{m} \) (Nearest Integer)
(Given : \( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \))

The number of species having a square planar shape from the following is __________ .
\( \mathrm{XeF_4}, \, \mathrm{SF_4}, \, \mathrm{SiF_4}, \, \mathrm{BF_4^-}, \, \mathrm{BrF_4^-}, \, [\mathrm{Cu(NH_3)_4}]^{2+}, \, [\mathrm{FeCl_4}]^{2-}, \, [\mathrm{PtCl_4}]^{2-} \)

When \( \mathrm{Fe_{0.93}O} \) is heated in presence of oxygen, it converts to \( \mathrm{Fe_2O_3} \). The number of correct statement/s from the following is \( \_\_\_\_\_ \).
I. The equivalent weight of \( \mathrm{Fe_{0.93}O} \) is \( \dfrac{\text{Molecular weight}}{0.79} \)
II. The number of moles of \( \mathrm{Fe^{2+}} \) and \( \mathrm{Fe^{3+}} \) in \( 1 \) mole of \( \mathrm{Fe_{0.93}O} \) is \( 0.79 \) and \( 0.14 \) respectively
III. \( \mathrm{Fe_{0.93}O} \) is metal deficient with lattice comprising of cubic closed packed arrangement of \( \mathrm{O^{2-}} \) ions
IV. The \( \% \) composition of \( \mathrm{Fe^{2+}} \) and \( \mathrm{Fe^{3+}} \) in \( \mathrm{Fe_{0.93}O} \) is \( 85\% \) and \( 15\% \) respectively

A sample of metal oxide has formula \( \mathrm{M_{0.83}O_{1.00}} \). The metal M can exist in two oxidation states \( +2 \) and \( +3 \). In the sample of \( \mathrm{M_{0.83}O_{1.00}} \), the percentage of metal ions existing in \( +2 \) oxidation state is ______ \( \% \). (Nearest integer)

A metal \( \mathrm{M} \) crystallizes into two lattices: face centred cubic \( (\mathrm{fcc}) \) and body centred cubic \( (\mathrm{bcc}) \) with unit cell edge length of \( 2.0 \) and 2.5 Å respectively. The ratio of densities of lattices fcc to bcc for the metal \( \mathrm{M} \) is ______. \([\text{Nearest integer}]\)

Match items of List-I with those of List-II:

Choose the most appropriate answer from the options given below:

The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in \( \mathrm{A}_x\mathrm{B}_{} \). The value of \( x \) is _______. (Integer answer)

The oxide that shows magnetic property is:

Diamond has a three dimensional structure of \( \text{C} \) atoms formed by covalent bonds. The structure of diamond has face centred cubic lattice where \( 50\% \) of the tetrahedral voids are also occupied by carbon atoms. The number of carbon atoms present per unit cell of diamond is ________ .

An atomic substance A of molar mass \( 12 \, \text{g mol}^{-1} \) has a cubic crystal structure with edge length of \( 300 \, \text{pm} \). The no. of atoms present in one unit cell of A is ________ . (Nearest integer)
Given the density of A is \( 3.0 \, \text{g mL}^{-1} \) and \( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \)

A cubic solid is made up of two elements X and Y. Atoms of X are present on every alternate corner and one at the center of cube. Y is at \( 1/3 \) rd of the total faces. The empirical formula of the compound is:

Ga (atomic mass \( 70 \, \text{u} \)) crystallizes in a hexagonal close packed structure. The total number of voids in \( 0.581 \, \text{g} \) of Ga is __________ \( \times 10^{21} \). (Round off to the Nearest Integer).

KBr is doped with \( 10^{-5} \) mole percent of \( \mathrm{SrBr}_2 \). The number of cationic vacancies in \( 1 \ \text{g} \) of KBr crystal is ________ \( \times 10^{14} \). (Round off to the Nearest Integer) [Atomic Mass: \( \mathrm{K}: 39.1\,\text{u} \), \( \mathrm{Br}: 79.9\,\text{u} \), \( N_A = 6.023\times 10^{23} \)]

In a solid \( \mathrm{AB} \), \( \mathrm{A} \) atoms are in ccp arrangement and \( \mathrm{B} \) atoms occupy all the octahedral sites. If two atoms from the opposite faces are removed, then the resultant stoichiometry of the compound is \( {A_xB_y} \). The value of \( x \) is _______. [Nearest integer]

Atoms of element \( X \) form hcp lattice and those of element \( Y \) occupy \( \frac{2}{3} \) of its tetrahedral voids. The percentage of element \( X \) in the lattice is ______________. (Nearest integer)

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

Which of the following material is not a semiconductor.

The incorrect statement about the imperfections in solids is:

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JEE Main 2021 18th March Evening Shift

A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an: