1681 + Interview Questions in SOLID-STATE IN GENERAL AWARENESS Page 4 InterviewSolution

151.	Classify the following solids in different categories based on the nature of intermolecular forces operating in them : Potassium sulphate , tin , benzene , urea , ammonia , water , zinc sulphide , graphite , rubidium , argon , silicon carbide .
Answer» Ionic solids Potassium sulphate , zinc sulphide (as they have ionic bonds) Covalent solids Graphite , silicon carbide (as they are covalent giant molecules ) . Molecular solids Benzene , urea , ammonia , water , argon (as they have covalent bond) . Metallic solids Rubidium , tin ( as these are metals ) .

Discussion

152.	(a) Based on the nature of intermolecular forces, classify the following solids . silicon carbide, Argon (b) ZnO turns yellow on heating , why ? (c ) what is meant by groups 12-16 compounds . Give an example.
Answer» Correct Answer - (a) `C_(6) H_(6) ` = Non - polar molecular solid , Ag = Metallic solid (b) N/A (C ) N/A

Discussion

153.	The correct statement in the following isA. The ionic crstal of AgBr has Schottky defectB. The unit cell having crystal parameters, `a=b nec,alpha=beta=90^(@),gamma=120^(@)` is hexagonalC. In ionic compounds having Frenkel defect the ratio `(gamma_(+))/(gamma_(-))` is highD. The coordination number of `Na^(+)` ion in NACl is 4.
Answer» Correct Answer - B A crystal system is hexagonal if its unit cell having `a=bnec` axial ratio and `alpha=beta=90^(@),gamma=120^(@)` axial angles.

Discussion

154.	In a crystalline solid, having formula `AB_(2)O_(4)` oxide ions are arranged in cubic close packed lattice while cations A are present in tetrahedral voids and cations B are present in octahedral voids. (a) What percentage of the tetrahedral voids is occupied by A? (b) What percentage of the octahedral voids is occupied by B ?A. 0.5B. 0.25C. 0.75D. `12.5%`
Answer» Correct Answer - D In a cubic close packed lattice of oxide ions, there would be two tetrahedral and one octahedral void per oxide ion. Since the formula shows the presenece of 4 oxide ions, the number of tetrahedral voids is eight and that of octahedral voids is four . Out of the eight tetrahedral voids one is occupied by A. `:.` Percentage of tetrahedral voids occupied `=(1)/(8)xx100=12.5%`

Discussion

155.	How many molecules are there in the unit cell of sodium chioride?A. `2`B. `4`C. `6`D. `8`
Answer» Correct Answer - b In `NaCI` (rock salty) Number of `Na^(+)` ions `= 12` (at edge centers ) `xx (1)/(4) xx 1` (at body centers ) `xx 1 = 4 ` Number of `CI^(-)` ions `= 8` (at centers )`xx (1)/(8) xx 6` (at face centers ) `xx (1)/(4)` Thus `4` formula units per unit cell

Discussion

156.	Nicker crystallizes in an fcc unit cell with a cell-edge length of 0.3524nm. Calcualte the radius of the nickel atomA. 0.1624nmB. 0.1246nmC. 0.2164nmD. 0.1426nm
Answer» Correct Answer - B For an fcc lattice, `d_("face")=asqrt(2)` or `4r_(Ni)=asqrt(2)` `r_(Ni)=(asqrt(2))/(4)=sqrt(2)/(4)xx0.3524=0.1246` nm

Discussion

157.	ZnO crystals on heating acquires the formuls `Zn(1+x)O`. Or There is an increase in conductivity when silicon doped with phosphorus. Give reason.
Answer» On heating, ZnO loses oxygen `O^(2-)` ions and changes to `Zn^(2+)` ions. Due to the presence of excess `Zn^(2+)` ions, `Zn(1+x)O` is formed. Or As as result of doping of group 14 element with group 15 element, the extra electrons available are responsible for increase in electrical conductivity. n-p type semi-conductors are formed as a result of this.

Discussion

158.	In which of the following crystal system F.C.C unit cells exists?A. Cubic, hexagonalB. Tetragonal, orthorhombicC. Orthorhobic , cubicD. Triclinic, monoclinic
Answer» Correct Answer - 3

Discussion

159.	Limiting radius ratio `((r_(+))/(r_(-)))` for co-ordination number six (octahedral arrangement ) isA. 0.155-0.225B. 0.225-0.414C. 0.414-0.732D. 0.732-1.000
Answer» Correct Answer - C For a octahedral arrangement co-ordination number is 6 and radius ratio `(r_(+)//r_(-))` is 0.414-0.732.

Discussion

160.	An `AB_(2)` type structure is found inA. `NaCI`B. `Al_(2)O_(3)`C. `CaF_(2)`D. `N_(2)O`
Answer» Correct Answer - c `AB_(2)` type of terthedral is present in `CaF_(2)` `:. AB_(2) hArr A^(2++) " " 2B^(-), CaF_(2) hArr Ca^(2+)+2F^(-)`

Discussion

161.	How many molecules are there in the unit cell of sodium chioride?A. 2B. 4C. 6D. 8
Answer» Correct Answer - B In NaCl (rock salt): Number of `Na^(+)` ions =12 (at edge centers) `xx(1)/(4)+1` (at body centre)`xx1=4`. Number of `Cl^(-)` ions =8 (at corners)`xx(1)/(8)+6` (at face centre)`xx(1)/(2)=4`. Thus 4 formula units per unit cell, ex`-NaNO_(3),CaSO_(4)`, calcite `CaCO_(3),HgS`

Discussion

162.	Which of the following systems is not correctly characeriseed?A. cubic a=b=c,`alpha=beta=gamma=90^(@)`B. tetragonal , a=b `cancel=c,alpha=beta=gamma=90^(@)`C. orthorhombic, `acancel=bcancel=c,alpha=beta=gamma=90^(@)`D. rhombohedral, `a=bcancel=c,alpha=beta=gamma=90^(@)`
Answer» Correct Answer - 4

Discussion

163.	Pure silicon doped with phosphorus is:A. AmorphousB. n-type semi conductorC. p-type semi-conductorD. insulator
Answer» Correct Answer - B

Discussion

164.	Out of seven crystal systems how many have body centred unit cell?A. 4B. 3C. 2D. 7
Answer» Correct Answer - 2

Discussion

165.	If `Z` is the number of atoms in the unit cell that represent the closed packing sequence `---ABCAB---` the number of terrahedral in the unit cell is equal toA. `Z`B. `2Z`C. `Z//2`D. `Z//4`
Answer» Correct Answer - b Number of terthedral voids in the unit cell `= 2 xx` number of atoms `= 2Z`

Discussion

166.	At the limiting value of radius ration `(r^+)/(r^-)`A. Force of attraction are larger than the forces of repulsionB. Forces of attraction are smaller than the forces of repulsionC. Forces of attraction and repulsion are just equalD. None of these
Answer» Correct Answer - C At the limiting value of radius ratio `(r^+/r^-)`, the forces of attraction and repulsion are just equal .

Discussion

167.	The limiting radius ratios of the complexes `[Ni(CN)_(4)]^(2-)` and `[NiCl_(4)]^(2-)` are respectivelyA. `0.225-0.414, 0.225-0.414`B. `0.414-0.732,0.414-0.732`C. `0.225-0.414,0.414-0.732`D. `0.414-0.732,0.225-0.414`
Answer» Correct Answer - A `[Ni(CN)_(4)]^(2-)` has square planar geometry `[NiCl_(4)]^(2-)` has tetrahedral geometry They have same limiting radius ratio

Discussion

168.	At the limiting value of radius ratio `r_(+)//r_(-)`A. Forces of attraction are larger than the forces of repulsionB. Forces of attraction are smaller than the forces of repulsionC. Forces of attraction andrepulsion are just equalD. None of these
Answer» Correct Answer - C At the limiting value of `r^(+)//r^(-)`, forces of attraction and repulsion are equal.

Discussion

169.	When potassium chloride is dissolved in waterA. Face centred cubicB. Body centred cubicC. Simple cubicD. Simple tetragonal.
Answer» Correct Answer - A Face centred cubic lattice found in KCL and NaCl.

Discussion

170.	Glass is a:A. Superccoled liquidB. Crystalline solidC. Liquid crystalD. none of these
Answer» Correct Answer - 1

Discussion

171.	The unit cell with crystallographic dimensions, `a ne b ne c, alpha =gamma=90^(@) and beta ne 90^(@)` is :A. Tetragonal systemB. orthorhombic systemC. monoclinic systemD. Triclinic system
Answer» Correct Answer - B `a ne b ne c, alpha = beta = gamma = 90^(@) ` represents orthorhombic system.

Discussion

172.	How many unit cells are possible for the crystallographic dimensions as `a cancel=bcancel=c alpha=gamma=90^(@) alphacacel=beta`A. 2B. 1C. 4D. 3
Answer» Correct Answer - 2

Discussion

173.	The unit cell with crystallographic dimensions, `a ne b ne c, alpha =gamma=90^(@) and beta ne 90^(@)` is :A. monoclinicB. tetragonalC. triclinicD. orthorhombic
Answer» Correct Answer - A

Discussion

174.	Example of unit cell with crystallographic dimension `a != b != c, alpha = gamma = 90^(@) `isA. calciteB. graphiteC. rhombic sulphurD. monoclinic sulphur
Answer» Correct Answer - d Monoclinic sulphur is an example of monoclinic crystal system

Discussion

175.	How many types of Bravais lattices can occur in crystalline solids?A. `14`B. `7`C. `10`D. `11`
Answer» Correct Answer - 1 There are seven crystal derived form seven poimitive unit cell. Some crystal systems, may have one or more types of lattices depending the number of lattice points. If there are lattice points only at the eight corners of a unit cell ,the result is a simple or primitive (P) lattice. A unit cell which has lattice points at the eight cornors and the six face centres creates a face centered `(F)` lattice. A unit cell which has eight lattice points at the corners and two more at the centres of a pair of any two opposite faces created an endcenred `(E)` . If a unit cell has eight lattice points at the cornors and one at the body centre,the result is a body centred `(B)` lattice. The unit of the type `F,E` and `B` are called non promitive cells . Based on the presence of lattice points in the seven crystal systems. There are fourteen Bravais lattices : orthorhombic (4), cubic (3), tetragonal (2), monoclinic (2), rhombohedral (1), hexagonal (1), and triclinic (1).

Discussion

176.	Argon crystallizes in FCC arrangement and density of solid and liquid argon is 3/7 and 3gm/cc respectively. Find percentage of empty space in liquid Ar.A. 17B. 34C. 68D. 82
Answer» Correct Answer - B First method Let the volume of sloid Ar=100mL. Mass of solid Ar= `Vxxrho=100xx1.59gcm^(-3)=159g` Volume of liquid Ar= `("Mass")/(rho)=(159g)/(1.42gcm^(-3))=112mL` Since Ar crystallizes in fcc-type lattice, the packing fraction (PF)=0.74 Actual volume occupie by Ar=PF xx Volume of solid Ar=`0.74xx100=74mL` % Empty space in liquid Ar= `((112-74))/(112)=33.92%`

Discussion

177.	Calculate the void space in closest packing of `n` spheres of radius 1 unit, `n` spheres of radius `0.414` units, and `2n` spheres of radius `0.225` units.A. 19B. 18C. 91D. 40
Answer» Correct Answer - A Since the packing is closest , therefore it is in fcc-type situation `Z_(eff)=4`/unit cell.

Discussion

178.	The limiting radius ratio of the complex `[Ni(CN)_(4)]^(2-)` isA. 0 to 0.155B. 0.115-0.225C. 0.225-0.414D. 0.414-0.732
Answer» Correct Answer - 3

Discussion

179.	The maximum number of Bravais lattices is shown by tetragonal-type crystals.
Answer» Correct Answer - F Maximum number of Bravais lattice is shown by orthorhombic-type crystal (four Bravais lattice, namely, primite, fc, bc, and end centred).

Discussion

180.	Which of the crystal systems has maximum number of Bravais lacttices?A. CubicB. MonoclinieC. TetragonalD. Orthorhombic
Answer» Correct Answer - 4 It has four Bravais lattices: Primitive Body centered face centred and End centred. Cubic has three Bravais lattices , Primitive Body centred and face centred. Tetragonal has two Bravais lattices: Primitive and Body centred.

Discussion

181.	How many types of Bravais lattices can occur in crystalline solids?A. 7B. 14C. 32D. 230
Answer» Correct Answer - B There are 14 Bravais lattices (space lattice).

Discussion

182.	The number of space lattices possible for the crystallographic dimentions `alphacancel=betacancel=gamma`A. 1B. 2C. 3D. 4
Answer» Correct Answer - 1

Discussion

183.	In case of a cubic system, the number of types of space lattices areA. 3B. 7C. 14D. 12
Answer» Correct Answer - 1

Discussion

184.	The fourteen types of space lattices are collectively called …….
Answer» Correct Answer - 4,6

Discussion

185.	Which of the crystal systems has more than one type of bravais lattices?A. HexagonalB. RhombohedralC. MonoclinicD. Triclinic
Answer» Correct Answer - 3 Monoclinic has two Bravais lattices: Primitive and End centred.

Discussion

186.	Select the incorrect statement `:`A. Stoichiometry of crystal remains uneffected due to Schottky defect.B. Frenkel defect usually shown by ionic compounds havin low coordination number.C. `F-` centres generation is responsible factor for imparting the colour to the crystalD. Density of crystal always increases due to substitutional impurity defect.
Answer» Correct Answer - 4 Density of crystal always increases due to substitutional impurity defect.

Discussion

187.	A compound formed by element `A` and `B` crystallizes in the cubic structure where `B` atoms are atg the face-centres. The formula of the compound isA. `AB_(3)`B. `AB`C. `A_(3)B`D. `A_(2)B_(2)`
Answer» Correct Answer - A `{:("Number of A atoms" = 8xx1/8=1),("Number of B atoms" = 6xx1/2=3):}]"Formula"=AB_(3)`.

Discussion

188.	How many kinds of space lattices are possible in a crystal?A. `23`B. `7`C. `230`D. `14`
Answer» Correct Answer - D

Discussion

189.	The coordination number of each atom in body centered cubic unit cell isA. `12`B. `6`C. `8`D. `5`
Answer» Correct Answer - 3 Each sphere is touched by eight neighbors ,four in the layer below and four in the layer above.Alternatively a body centered atoms is in direct touch with `8` corner atoms and each corner atom is shared by `8` unit cells where it is touched by the body centered atoms.

Discussion

190.	In the spinel structure, oxides ions are cubical`-` closest packed whereas `1//8 th` of tetrahedral voids are occupied by `A^(2+)` cation and `1//2` of octahedral voids are occupied by `B^(2+)` cations. The general formula of the compound having spinel structure is `:`A. `A_(2)B_(2)O_(4)`B. `AB_(2)O_(4)`C. `A_(2)B_(4)O_(2)`D. `A_(4)B_(2)O_(2)`
Answer» Correct Answer - B Effective no. of `O^(2-)` in a unit cell `=8xx(1)/(8)+6xx(1)/(2)=4` Effective no of `A^(2+)` in a unit cell `=8xx(1)/(8)=1` Effective no. of `B^(3+)` in a unit cell `=4xx=2" ":." "` general formula is `AB_(2)O_(4)`

Discussion

191.	Potassium crystallizes with aA. Face-centred cubic latticeB. Body-centred cubic latticeC. Simple cubic latticeD. Orthorhombic lattice
Answer» Correct Answer - B

Discussion

192.	Potassium crystallizes with aA. face centered cubic lattic structureB. hexagonal closest packed structureC. primitive cubic lattice structureD. body centered cubic lattice structure
Answer» Correct Answer - 4 At room temperature all the alkali metals posses body centred cubic lattice.

Discussion

193.	The atomic radius of strontium `(Sr)` is `215 p m` and it crystallizes with a cubic. Closest packing . Edge length of the cube is `:`A. 4.30pmB. 608.2pmC. 496.53pmD. none of these
Answer» Correct Answer - B

Discussion

194.	The atomic radius of strontium `(Sr)` is `215 p m` and it crystallizes with a cubic. Closest packing . Edge length of the cube is `:`A. `430 p m`B. `608.2p m`C. `496.53p m`D. none of these
Answer» Correct Answer - 2 The ccp of structure generates fcc unit cell So, `sqrt(2a)=4r` `a=608.2p m`

Discussion

195.	Calculate the packing fraction and density of diamond if a = 3.57Å . Diamond crystallizes in fcc lattice with some more carbon atoms in alternate tetrahedral voids.
Answer» C-atoms per cell of fcc lattice =4 No .of tetrahedal voids = 4 As C -atoms are present in alternate tetrahedral voids. no. of C-atoms in tetrahedrl voids = 4 Total no. of C -atoms in the unit cell of diamed = 4+ 4 =8 ,i.e., Z=8 packing fraction =` ("Volume occupied by spheres")/("Volume of the unit cell") = (8 xx 4/3 pi r^(3))/a^(3) = 8 xx 4/3 xx (pir^(3))/a^(3)` As alternate tetrahedral voids are also occupied by C-atoms , it can by seen that ` sqrt3 a = 8r or a = (8r)/sqrt3` packing effeiciency = `(8 xx 4/3 pi r^(3))/ ((8r)/sqrt3)^(3) = 32/3 xx 22/7 xx (3sqrt3)/( 8 xx8xx8) = 0.43` density ` p = (ZM)/(a^(3)N_(0)) = ( 8 xx 12)/((3.57xx10^(-8))^(3) (6.023 xx 10^(23)) = 3.5"g/cm"^(3)`

Discussion

196.	Potassium crystallizes with aA. Face - centred cubic latticeB. Body - centered cubic latticC. Simple cubic latticD. Orlhorhombic lattice
Answer» Correct Answer - b Potassium `(K)` has bcc lattice.

Discussion

197.	The packing fraction of the element that crystallizes in simple cubic arrangement isA. `(pi)/(4)`B. `(pi)/(6)`C. `(pi)/(3)`D. `(pi)/(2)`
Answer» Correct Answer - b `P.E. = ((4)/(3) pi r^(3)xx1 )/(a^(3)) = ((4)/(3) pi r^(3))/((2r)^(3)) = (pi)/(6)`

Discussion

198.	Potassium crystallizes is a bcc lattice the coordination number of potassiium in potassium metal isA. `0`B. `4`C. `6`D. `8`
Answer» Correct Answer - d For bcc lattice, co- crdination number is `8`.

Discussion

199.	In a compound atoms of element `Y` form cup lattice and those of element `X` occupy `2//3^(rd)` of lettabedral voids .The foemula of the compound will beA. `X_(3)Y_(4)`B. `X_(4)Y_(3)`C. `X_(2)Y_(3)`D. `X_(2)Y`
Answer» Correct Answer - b In a cup array number of tetrahefral voids is swich the number of atom `y:x: :1 [(2)/(3) xx 2] = 3:4` `rArr X_(3)Y_(4)`

Discussion

200.	In corrundum, oxid ions are arranged in `h.c.p.` array and the aluminum ions occupy two`-`thirds of octahedral voids. What is the formula of currundum ?
Answer» Correct Answer - `Al_(2)O_(3);`

Discussion

Explore topic-wise InterviewSolutions in .

Classify the following solids in different categories based on the nature of intermolecular forces operating in them : Potassium sulphate , tin , benzene , urea , ammonia , water , zinc sulphide , graphite , rubidium , argon , silicon carbide .

(a) Based on the nature of intermolecular forces, classify the following solids . silicon carbide, Argon (b) ZnO turns yellow on heating , why ? (c ) what is meant by groups 12-16 compounds . Give an example.

How many molecules are there in the unit cell of sodium chioride?A. `2`B. `4`C. `6`D. `8`

Nicker crystallizes in an fcc unit cell with a cell-edge length of 0.3524nm. Calcualte the radius of the nickel atomA. 0.1624nmB. 0.1246nmC. 0.2164nmD. 0.1426nm

ZnO crystals on heating acquires the formuls `Zn(1+x)O`. Or There is an increase in conductivity when silicon doped with phosphorus. Give reason.

In which of the following crystal system F.C.C unit cells exists?A. Cubic, hexagonalB. Tetragonal, orthorhombicC. Orthorhobic , cubicD. Triclinic, monoclinic

Limiting radius ratio `((r_(+))/(r_(-)))` for co-ordination number six (octahedral arrangement ) isA. 0.155-0.225B. 0.225-0.414C. 0.414-0.732D. 0.732-1.000

An `AB_(2)` type structure is found inA. `NaCI`B. `Al_(2)O_(3)`C. `CaF_(2)`D. `N_(2)O`

How many molecules are there in the unit cell of sodium chioride?A. 2B. 4C. 6D. 8

Which of the following systems is not correctly characeriseed?A. cubic a=b=c,`alpha=beta=gamma=90^(@)`B. tetragonal , a=b `cancel=c,alpha=beta=gamma=90^(@)`C. orthorhombic, `acancel=bcancel=c,alpha=beta=gamma=90^(@)`D. rhombohedral, `a=bcancel=c,alpha=beta=gamma=90^(@)`

Pure silicon doped with phosphorus is:A. AmorphousB. n-type semi conductorC. p-type semi-conductorD. insulator

Out of seven crystal systems how many have body centred unit cell?A. 4B. 3C. 2D. 7

If `Z` is the number of atoms in the unit cell that represent the closed packing sequence `---ABCAB---` the number of terrahedral in the unit cell is equal toA. `Z`B. `2Z`C. `Z//2`D. `Z//4`

At the limiting value of radius ration `(r^+)/(r^-)`A. Force of attraction are larger than the forces of repulsionB. Forces of attraction are smaller than the forces of repulsionC. Forces of attraction and repulsion are just equalD. None of these

The limiting radius ratios of the complexes `[Ni(CN)_(4)]^(2-)` and `[NiCl_(4)]^(2-)` are respectivelyA. `0.225-0.414, 0.225-0.414`B. `0.414-0.732,0.414-0.732`C. `0.225-0.414,0.414-0.732`D. `0.414-0.732,0.225-0.414`

At the limiting value of radius ratio `r_(+)//r_(-)`A. Forces of attraction are larger than the forces of repulsionB. Forces of attraction are smaller than the forces of repulsionC. Forces of attraction andrepulsion are just equalD. None of these

When potassium chloride is dissolved in waterA. Face centred cubicB. Body centred cubicC. Simple cubicD. Simple tetragonal.

Glass is a:A. Superccoled liquidB. Crystalline solidC. Liquid crystalD. none of these

The unit cell with crystallographic dimensions, `a ne b ne c, alpha =gamma=90^(@) and beta ne 90^(@)` is :A. Tetragonal systemB. orthorhombic systemC. monoclinic systemD. Triclinic system

How many unit cells are possible for the crystallographic dimensions as `a cancel=bcancel=c alpha=gamma=90^(@) alphacacel=beta`A. 2B. 1C. 4D. 3

The unit cell with crystallographic dimensions, `a ne b ne c, alpha =gamma=90^(@) and beta ne 90^(@)` is :A. monoclinicB. tetragonalC. triclinicD. orthorhombic

Example of unit cell with crystallographic dimension `a != b != c, alpha = gamma = 90^(@) `isA. calciteB. graphiteC. rhombic sulphurD. monoclinic sulphur

How many types of Bravais lattices can occur in crystalline solids?A. `14`B. `7`C. `10`D. `11`

Argon crystallizes in FCC arrangement and density of solid and liquid argon is 3/7 and 3gm/cc respectively. Find percentage of empty space in liquid Ar.A. 17B. 34C. 68D. 82

Calculate the void space in closest packing of `n` spheres of radius 1 unit, `n` spheres of radius `0.414` units, and `2n` spheres of radius `0.225` units.A. 19B. 18C. 91D. 40

The limiting radius ratio of the complex `[Ni(CN)_(4)]^(2-)` isA. 0 to 0.155B. 0.115-0.225C. 0.225-0.414D. 0.414-0.732

The maximum number of Bravais lattices is shown by tetragonal-type crystals.

Which of the crystal systems has maximum number of Bravais lacttices?A. CubicB. MonoclinieC. TetragonalD. Orthorhombic

How many types of Bravais lattices can occur in crystalline solids?A. 7B. 14C. 32D. 230

The number of space lattices possible for the crystallographic dimentions `alphacancel=betacancel=gamma`A. 1B. 2C. 3D. 4

In case of a cubic system, the number of types of space lattices areA. 3B. 7C. 14D. 12

The fourteen types of space lattices are collectively called …….

Which of the crystal systems has more than one type of bravais lattices?A. HexagonalB. RhombohedralC. MonoclinicD. Triclinic

A compound formed by element `A` and `B` crystallizes in the cubic structure where `B` atoms are atg the face-centres. The formula of the compound isA. `AB_(3)`B. `AB`C. `A_(3)B`D. `A_(2)B_(2)`

How many kinds of space lattices are possible in a crystal?A. `23`B. `7`C. `230`D. `14`

The coordination number of each atom in body centered cubic unit cell isA. `12`B. `6`C. `8`D. `5`

Potassium crystallizes with aA. Face-centred cubic latticeB. Body-centred cubic latticeC. Simple cubic latticeD. Orthorhombic lattice

Potassium crystallizes with aA. face centered cubic lattic structureB. hexagonal closest packed structureC. primitive cubic lattice structureD. body centered cubic lattice structure

The atomic radius of strontium `(Sr)` is `215 p m` and it crystallizes with a cubic. Closest packing . Edge length of the cube is `:`A. 4.30pmB. 608.2pmC. 496.53pmD. none of these

The atomic radius of strontium `(Sr)` is `215 p m` and it crystallizes with a cubic. Closest packing . Edge length of the cube is `:`A. `430 p m`B. `608.2p m`C. `496.53p m`D. none of these

Calculate the packing fraction and density of diamond if a = 3.57Å . Diamond crystallizes in fcc lattice with some more carbon atoms in alternate tetrahedral voids.

Potassium crystallizes with aA. Face - centred cubic latticeB. Body - centered cubic latticC. Simple cubic latticD. Orlhorhombic lattice

The packing fraction of the element that crystallizes in simple cubic arrangement isA. `(pi)/(4)`B. `(pi)/(6)`C. `(pi)/(3)`D. `(pi)/(2)`

Potassium crystallizes is a bcc lattice the coordination number of potassiium in potassium metal isA. `0`B. `4`C. `6`D. `8`

In a compound atoms of element `Y` form cup lattice and those of element `X` occupy `2//3^(rd)` of lettabedral voids .The foemula of the compound will beA. `X_(3)Y_(4)`B. `X_(4)Y_(3)`C. `X_(2)Y_(3)`D. `X_(2)Y`

In corrundum, oxid ions are arranged in `h.c.p.` array and the aluminum ions occupy two`-`thirds of octahedral voids. What is the formula of currundum ?