Question 1 :
In a face centred cubic cell, what is the contribution of an atom at the face-center?
Question 2 :
In a face centred cubic lattice the number of nearest neighbours for a given lattice point are :
Question 4 :
Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be :
Question 5 :
Sodium metal exists in bcc unit cell. The distance between nearest sodium atoms is $0.368\ nm$. The edge length of the unit cell is:
Question 6 : In crystal structure of rock salt <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ead48a9381c2135355c6d15"> , the arrangement of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ead483041e6ca4117817d30"> ion is :
Question 8 :
Which is the wrong statement regarding a crystal containing Schottky defect?
Question 9 :
In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is:
Question 11 :
In $CaF_2$ lattice coordination number of $Ca^{+2}$ & $F^-$ is :
Question 13 :
In a crystal some ions are missing from normal sites. This is an example of :
Question 15 :
The edge length of a face centred cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anions is
Question 18 : Consider the following fcc unit cells choose the correct option<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ef6e381f5ca3c63ed733afa"><br>
Question 19 :
How many number of atoms are there in a cube based unit cell having one atom on each corner and two atoms on each body diagonal of cube
Question 20 :
In a cubic close packing of spheres in three dimensions, the co-ordination number of each sphere is :
Question 22 :
How many unit cells are present in {tex} 39 \mathrm { g } {/tex} of potassium that crystallises in body centred cubic structure? [At. wt. of {tex} \mathrm { K } = 39 {/tex} ]
Question 24 : $I$. Metallic solids tend to be very brittle.<div>$II$. Metallic bonds are broken quite easily.</div>
Question 25 :
If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?
Question 28 :
A metal crystallises into a lattice containing a sequence of layers as AB AB AB _______. What percentage of voids are left in the lattice?
Question 29 :
Among the following types of voids, which one is the largest void?
Question 30 :
The number of hexagonal faces that are present in a truncated octahedron is
Question 32 : A metallic element crystallises into lattice containing a sequence of layers of <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ead484e86ab836963762e5a"> . Any packing of spheres leaves out void in the lattice. The empty space in percentage by volume in this lattice is :
Question 33 :
In the rock salt structure, the number of formula units per unit cell is equal to:
Question 35 :
The three states of matter are solid, liquid and gas, which of the following statements are correct about them?
Question 36 :
The phenomenon in which polar crystals on heating produce electricity is called :
Question 37 :
The phenomenon in which crystals on subjecting to a pressure or mechanical stress produce electricity is called :
Question 38 :
The unit cell of a binary compound of $A$ and $B$ metals has a ccp structure with $A$ atoms occupying the corners and $B$ atoms occupying the centers of each face of the cubic unit cell. If during the crystallization of this alloy, in the unit cell two $A$ atoms are missed, the overall composition per unit cell is:
Question 40 :
The percentage of {tex} \mathrm { Fe } ^ { + 3 } {/tex} ion present in {tex} \mathrm { Fe } _ { 0.93 } \mathrm { O } _ { 1.00 } {/tex} is
Question 41 :
Assertion: Bragg's equation has no solution, if $n=2$ and $\lambda>d$
Reason: Bragg's equation is $n\lambda=2d\sin{\theta}$
Question 42 : <div>Statement: The melting point of all substances decreases with pressure increase.<br/></div><div><br/></div><div>State whether the given statement is true or false.</div>
Question 43 :
In a close-packed structure of mixed oxides, the lattice is composed of oxide ions, one-eighth of octahedral voids are occupied by divalent cations while one-half of octahedral voids are occupied by a trivalent cation. The formula of oxide is:
Question 44 :
Which one of the following schemes of ordering closed packed sheets of equal sized spheres do not generate close packed lattice?
Question 45 :
In the Bragg's equation for diffraction of X-rays, $n$ represents for
Question 48 :
The unit cell with crystallographic dimensions, $a\ne b\ne c$, $\alpha=\gamma=90$ and $\beta\ne 90$ is called :
Question 49 :
In chromium chloride $(CrCl_3)$, $Cl^-$ ions have cubic close packed arrangement and $Cr^{3+}$ ions are present in the octahedral holes. The fraction of the total number of holes occupied is:
Question 55 :
The more efficient mode of packing of identical atoms in one layer is :
Question 56 :
Gold crystallises in fcc centred cubic structure. If atomic mass of gold is $197\ g \ mol^{-1}$, the mass of the unit cell of gold will be:
Question 57 :
Structure of a mixed oxide is cubic close-packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One-fourth of the tetrahedral voids are occupied by divalent metal $A$ and the octahedral voids are occupied by a monovalent metal $B$. The formula of the oxide is:
Question 58 :
How many chloride ions are surrounding sodium ion in a sodium chloride crystal?
Question 59 :
In a cubic unit cell, $A$ atoms are present on alternate faces and $C$ atoms are present on alternate edges and body centre of the cube. the simplest formula of compound is:
Question 60 :
A crystal formed by two elements $X$ and $Y$ in cubic structure. $X$ atoms are at the corners of cube while $Y$ atoms are at the face center. The formula of he compound will be:
Question 61 :
Potassium crystallizes in a body-centered cubic unit cell. The mass of the unit cell is:
Question 62 :
in the fcc lattice of particle $A,\ B$ particles occupy all tetrahedral void and $C$ occupy all octahedral void. Find the correct relation for closest distance between particle $B$ and $C$. Given radius of particle $A$ is 200 A.
Question 65 :
The number of atoms present in a unit cell of a monoatomic element of a simple cubic lattice, body-centered cubic and face-centered cubic respectively is:
Question 67 :
If we know the ionic radius ratio in a crystal of ionic solid, what can be known of the following?
Question 68 :
The total number of elements of symmetry in a cubic crystal is:
Question 69 :
In a compound, atoms of element Y form ccp lattice and those of element X occupy $2/3^rd$ of tetrahedral voids. The formula of the compound will be:
Question 70 :
The CsCl structure is observed in alkali halides only when the radius of the cation is sufficiently large to keep its eight nearest-neighbour anions from touching. What minimum value of $r_{+}/ r_{-}$ is needed to prevent this contact?
Question 71 :
Which of the following arrangements correctly represents hexagonal and cubic close packed structure respectively?
Question 72 :
A solid is formed by two elements $P$ and $Q$. The element $Q$ forms cubic close packing and atoms of $P$ occupy one-third of tetrahedral voids. The formula of the compound is:
Question 73 :
In a unit cell, atoms A, B, C and D are present at half of total corners, all face-centres, body-centre and one third of all edge-centres respectively. Then formula of unit cell is ?
Question 74 :
In the crystal $A^{2+}B^{2-}$, having anions in the face centred cubic packing if the radius of the anion if $1.84A^0$, ideal radius of the cation present in the tetrahedral hole will be:
Question 76 : <div>Statement: The relation between the d-spacing formula and Bragg's equation for a cubic crystal for first-order reflection is given by the relation:<br/></div>$\text{sin}\ \theta ={ \dfrac {\lambda }{2a} (h^2 + k^2+l^2})^{\frac{1}{2}}$<br/><div>State whether the given statement is true or false.<br/></div>
Question 77 :
If the height of $HCP$ unit cell of identical particles is $h$, then height of octahedral voids from the base is________.
Question 78 :
A substance $A_{x}B_{y}$ crystallizes in an f.c.c. lattice in which atoms of $A$ occupy each corner of the cube and atoms of $B$ occupy the centres of each face of the cube. Identify the correct composition of the substance $A_{x}B_{y}$.
Question 79 :
A compound formed by elements A and B crystallizes in the cubic structure where A atoms are at the corners of a cube and B atoms are at the face-centers. The formula of the compound is:
Question 80 :
Which of the following statement is not true about the voids?
Question 81 :
An element crystallizes in FCC lattice of edge length $400$pm. Calculate the maximum diameter which can be placed in interstitial sites without distorting the structure.
Question 82 :
The density of argon (face centered cubic cell) is $1.83\, g/cm^3$ at $20^oC$. What is the length of an edge a unit cell?
Question 83 :
A compound formed by elements $X$ and $Y$ crystallizes in a cubic structure, where $X$ is at the corners of the cube and $Y$ is at six face centers. What is the formula of the compound?
Question 84 :
In a crystalline solid, anions $B$ are arranged in ccp lattice and cations $A$ occupy $50$% of the octahedral voids and $50$% of the tetrahedral voids. What is the formula of the solid?
Question 85 :
An ionic solid has ${C_5}Cl$ structure. The length of body diagonal is $7.0\,\mathop {\text{A}}\limits^{\text{o}} .$ The edge length of the cube and inter-ionic distance respectively are:
Question 86 :
Statement 1: In a crystal of $Ca$, the separation of $(1,1,1)$ planes is twice as great as that of $(2,2,2)$ planes.<br/>Statement 2: The length of the side of crystal lattice is $0.556$ nm $(\sqrt{12}=3.46)$.
Question 87 :
A solid has three types of atoms $X,\ Y$ and $Z$. $X$ forms an $FCC$ lattice with $Y$ atoms occupying all the tetrahedral voids and $Z$ atoms occupying half of the octahedral voids. The formula of the solid is
Question 88 :
A binary solid has a primitive cubical structure with $B^-$ ions constituting the lattice points and $A^+$ ions occupying 25% of its tetrahedral holes. The molecular formula of the crystal is:<br/>
Question 89 :
The density and edge length values for a crystallise elemens with $fcc$ lattice are $10 g$ $cm^{-3}$ and 400 pm, respectively. The number of unit cell in $32 g$ of this crystal is:
Question 90 :
The pattern of successive layers of ccp arrangement can be designated as:
Question 91 :
In a close-packed structure of mixed oxides, the lattice is composed of oxide ions, one-eighth of tetrahedral voids are occupied by divalent cations $A$ while one-half of octahedral voids are occupied by trivalent cations $B$. The formula of the oxide is:
Question 92 :
$Al$(at.wt.$27$) crystallizes in the cubic system with a cell edge of $4.05\mathring { A } $. Its density is $2.7g/{ cm }^{ 3 }$. Determine the unit cell type and calculate the radius of the $Al$ atom.
Question 93 :
Assertion: It occupies certain holes of this type but not the other holes of the same type?
Reason: The proximity of two cations $(A^{2+ }\,\,and \,\,B^{4+})$ would be electrostatically unfavourable.
Question 94 :
Aluminium crystallizes in a cubic close packed structure. Its metallic radius is $125pm$.<br>i) Calculate the edge length of unit cell<br>ii) How many unit cells are there in $1.00cm^3$ of aluminium?
Question 95 :
An element $X$ (At. wt. = 80g/mol) having fcc structure, calculate no. of unit cell in $8\ gm$ of $X$.
Question 96 : The ratio of the volume of a tetragonal lattice unit cell to that of a hexagonal lattice unit cell is: <div>(both having same respective lengths)</div>
Question 97 :
A crystalline solid between A and B has the following arrangement of atoms: <br/>(i) Atoms A are arranged in a CCP array.<br/>(ii) Atoms B occupy all the octahedral voids and half of the tetrahedral voids.<br/>What is the formula of the compound?<br/>
Question 98 :
$CsCl$ crystallizes in a cubic lattice that has a $Cl^-$ at each corner and $Cs^+$ at the centre of the unit cell. If $(r_{Cs^+})=1.69\overset{o}{A}$ and $(r_{Cl^-})=1.81\overset{o}{A}$, what is the value of edge length a of the cube?<br>
Question 99 :
$AB$ crystallises in a bcc lattice with edge length an equal to 387 pm. The distance between two oppositely charged ions in the lattice is:<br/>
Question 100 :
An alloy of $Cu, Ag$ and $Au$ is found to have copper constituting fcc lattice. If silver atoms occupy the edge-centers and gold is present at body-center, the alloy has the formula _______.
Question 102 :
An alloy of copper and gold crystallizes in a cubic lattice in which the gold atoms occupy the lattice points at the corners of cube and copper atoms occupy the centre of each face. The formula of this compound is :
Question 103 :
If in a cubic cell, atoms $A$ present at all corners and atoms $B$ at the center of each face. What will be the molecular formula of the compound, if all the atoms present in one body diagonal are replaced by atom $C$?<br>
Question 104 :
Radii of $A^+$ and that of $X^-$ and $Y^-$ have been given as<br/>$A^+=1.00$ pm<br/>$X^-=1.00$ pm<br/>$Y^-=2.00$ pm<br/>Determine the volume of unit cells of AX and AY crystals.<br/>
Question 105 :
$Na$ and $Mg$ crystallize in $BCC$ and $FCC$ type crystals respectively, then the number of atoms of $Na$ and $Mg$ present in the unit cell of their respective crystal is<br>
Question 106 :
A binary solid $(A^+B^-)$ has a zinc blende structure with $B^-$ ions constituting the lattice and $A^+$ ions occupying $25\%$ tetrahedral holes. The formula of solid is:
Question 107 :
Aluminium (atomic mass = 27) crystallises in a cubic system with edge length of 4A. Its density is $2.7\, g\, cm^{-3}$. The number of aluminium atoms present per unit cell is:
Question 108 :
In a solid $AB$ having $NaCl$ structure atoms, occupy the corners of the unit cell. If all the face centred atoms along one of the axis are removed, then the resultant stoichiometry of the solid is:<br>
Question 109 :
In a cubic arrangement of atoms of A, B and C, atoms of A are present at the corners of the unit cell, B atoms are at face centers and C at tetrahedral voids. If one of the atom from one corner is missing in the unit cell, then the simplest formula of the compound will be:
Question 110 :
A solid is formed and it has three types of atoms X, Y, Z. X forms an FCC lattice with Y atoms occupying one-forth of tetrahedral viods and Z atoms occupying half of the octahedral voids. The formula of the solid is?
Question 112 :
A solid has a structure in which $W$ atoms are located at the corners of a cubic lattice, $O$ atoms at the centre of the edges and $Na$ atoms at the centre of the cubic. The formula for the compound is:
Question 114 :
Aluminium crystallizes in a cubic close packed structure. Its metallic radius is $125$ pm. The edge length (in pm) of the unit cell and number of unit cells per cc of aluminium, respectively, are :
Question 115 :
A crystal is made up of particles A, B, and C, A forms fcc packing, B occupies all octahedral voids and C occupies all tetrahedral voids. If all the particles along one body diagonal are removed, then the formula of the crystal would be:
Question 117 :
Iron crystallizes in several modifications, At about $910^o$C, the body centred $\alpha$-form undergoes transition to the face centred cubic $\gamma$-form. Assuming that the distance between nearest neighbours is same in the two forms at the transition temperature. Calculate the ratio of density of $\gamma$-iron to that of $\alpha$-iron at the transition temperature.
Question 118 : An element crystalline in body centered cubic lattice has an edge of 500 pm. If its density is 4 g $cm^{-3}$, the atomic mass of the element (in g $mol^{-1}$) is: <div>(consider $N_A=6\times10^{23}$) <br/></div>
Question 119 :
In metal oxide, the oxide ions are arranged in corners as well as on faces and metal cation occupy $\dfrac{2}{3}$ of octahedral voids, the formula of oxide is:
Question 120 :
In a non stoichiometric sample of ferrous oxide with NaCl structure, the ratio of $Fe^{+3}$ to $Fe^{2+}$ was found to be 0.15. The fraction of octahedral sites occupied by vacancies is :<br/>
