Solid state Questions and Answers

A solid AB has ZnS structure If the radius of cation A is 100 pm what is the radius of ani 3

Which one of the following has a different crystal lattice from those of the rest 1 Ag 3 Cu 2 V 4 Pt

The radius of A is 66 pm and the radius of B is 140 pm Predict the probable co ordination number of A ions

53 Stacking of square close packed layers give rise to a bcc structure c Simple cubic structure pol close packed hcp structure of spheres the fraction of the volume occupied by when it will b fcc structure d hcp structure give dcc nepoz b co

If a stands for the edge length of the cubic sys tems simple cubic body centred cubic and face centred cubic then the ratio of radii of the spheres in these system will be respectively 1 1 a 3a 2 3 la 3a 2 a 3 2 2 1 3 2 a 2 1 3 4 a 1 a 2

4x 107 9 10 kg mol 408 6 10 2 m 6 022 10 mol 10 5x10 kg m 10 5 g cm 11 Intext Questions What is the two dimensional coordination number of a molecule in square close packed layer 5 A compound forms hexagonal close packed structure What is the total number of voids in 0 5 mol of it How many of these are tetrahedral voids

Calculate the radius of molybdenum atom if the element crystallises as body centered cubic crystals Given density of Mo 10 3 g cm 3 molar mass of Mo 95 94 g mol 1

Which of the following compound is paramagnetic II ion 1 Tetracyanonickelate 2 Tetraamminezinc II ion 3 Hexaamine chromium III ion 4 Diammine silver I ion

3 A given metal crystallizes out with a cubic structure having edge length of 361 pm If there are four metal atoms in one unit cell what is the radius of one atom 1 127 pm 2 80 pm

If the molar volume of KCI and NaCl are x mL and y mL respectively then the ratio of the edge length of FCC unit cells of KCI and NaCl will be 1 3 1 3 X 1 3 58 5 74 5y 1 3 2 4 58 5y 74 5x 74 5 x 58 5 y 1 3

8 Which type of crystal system contain only one Bravais lattice 1 Hexagonal 3 Cubic 2 Tetragonal 4 Monoclinic

In a ccp type structure if two atoms from corners are removed then percentage void in unit cell is approximately 1 40 21 26 2 30 4 20

Density of Li atom is 0 53 g cm 3 The edge length of Li is 3 5 Find out the number of Li atoms in an unit cell NA 6 023 x 1023 M 6 94 g mol 1 0153x6023x10 X 1 2 4 66 9 2 8 3 4

In a NaCl type crystal distance between Na and CI ion is 2 814 and the density of solid is 2 167 g cm3 then find out the value of Avogadro NA 2XM 4 x5 815 814 x 10 8 constant 1 6 05 x 1023d xa 3 12 10 x 1023 2 3 02 x 1023 4 9 6 x 1024

L A solid A B has NaCl type close packed structure If the anion has a radius of 250 pm should be the ideal radius for the cation Can a cation C having a radius of 180 pm be slip into the tetrahedral site of the crystal A B Give reason for your answer

Assertion In rock salt structure the sodium ions occupy octahedral voids Reason The radius ratio r r in case of NaCl lies betwen 0 225 to 0 414 1 A 4 D 2 B 3 C Ans 3

17 An element crystallises in fcc lattice having edge length 400 pm What is the maximum diam atom which can be placed in interstitial site without distorting the structure 4 140 pm 1 117 pm 2 130 pm 3 135 pm

No of un A metal has BCC structure and the edge length d its unit cell is 3 04 The volume of the unit cell i cm will be a 0 1 1 6 x 10 21 cm 3 6 02 x 10 23 cm 2 2 81 x 10 23 cm 4 6 6 x 10 24 cm

Metal M of radius 50 nm is crystallized in type and made cubical crystal such that face of unit cells aligned with face of cubical crystal If the total number of metal atoms of M at all faces of cubical crystal is 6x1030 then the area of one face of cubical crystal is Ax10 6 m Find the value of A

The ionic radii of Rb and I are 1 46 and 2 16 A respectively The most probable type of structure exhibited by it is 1 CsCI type 3 ZnS type 2 NaCl type 4 CaF type

4 Which is the incorrect statement 1 Density decrease in case of crystals with Schottky s defect 2 NaCl s is insulator silicon is semiconductor silver conductor quartz is piezo electric crystal 3 Frenkel defect is favoured in those ionic compounds which sizes of cation and anions are almost equal 4 FeO0 98 has non stoichiometric metal deficiency def CT 30171 r

Number of unit cells in 0 1 g molecule NaCl is 1 0 1 N 2 0 025 N 3 0 5 N A 4 0 25 N S C V 0

Which of the following statement is are true about the ionic solids A B C D Bigger ions form the close packed structure Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size Occupation of all the voids is not necessary The fraction of octahedral or tetrahedr voids occupied depends upon the radii

A unit cell of BaCl fluorite structure is made up of a four Ba ions and four Clions 2 2 b four Ba ions and eight CIT ions 2 c eight Ba ions and four CI ions d four Ba2 ions and six Cl ions

A bcc lattice is made up of hollow spheres of B Spheres of solids A are present in hollow spheres of B The radius of A is half of the radius of B The ratio of total volume of spheres of B unoccupied by A in a unit cell and volume of unit cell is Ax T 3 64 Find the value of A

NaCl is doped with 10 4 mol SrCl the o concentration of cation vacancies is Hint Concentration of vacancies 1 6 02 x 10 5 mol 1 3 6 02 x 10 7 mol 10 4 100 N A 2 6 02 x 10 6 mol 4 6 02 x 10 4 mol

4 O ions are arranged in ccp in a spinel structure ions occupy 1 8 of TVs and B ions occupy half of OV The void volume of unit cell 0 11 A Find the value of A

7 Silver atomic weight 10 g mol has a density of 10 5 g cm The number of silver atoms on a surface of area 10 12m can be expressed in scientific notation as y 10 The value of x is a 3 b 5 c 7 d 9

If a solid AB having ZnS structure is heated so that the ions along two of the axis passing through the face center particles are lost and bivalent ion Z enters here to maintain the electrical neutrality so that the new formula unit becomes Ax ByZc Report the value of x y c

IUPAC name of chloroform is O Chloromethane O Dichloromethane O Trichloromethane

The vapour pressure of water at 80 C saturated with water the total pressure being 760 mm of Hg The contents of the vessel were pumped into 0 3 L vessel at the same temperature What is the partial pressure of O D 455 Hg C 123 5 Hg A 1350 Hg B 2263 3 Hg

d A sample of water is found to be contain following dissolving salt in mg L Name of hardness causing salt Mg HCO CaCl Ca HCO MgSO MgCl NaCl FeSO Total Ten and Permanent Amount of hardness causing salts mg L 7 3 11 1 8 1 4 0 9 5 10 5

Crystal solid consist of X and Y atoms X atom shows ccp structure and Y atom occupied 50 of tetrahedral voids If all corner atoms are removed from the crystal solid then simplest molecular formula of the crystal will be PX4Y3 O X3 Y4 O X2Y3 O Y Yn

21 Arrange the following polymers in increasing order of their intermolecular force Nylon 6 6 Bakelite Buna S Polythene A G R A A R G U C U G A R Q No 21 OA OB OC OD B R A G U D A R U G

In Haber process 30 L of dihydrogen and 30L of linitrogen were taken for reaction which yielded only 50 of the expected product What will be the composition of the gaseous mixture under the aforesaid conditions in the end 1 20L NH3 25LN and 20LH 2 10L NH3 25L N and 15LH 3 20LNH3 10LN and 30LH 4 20L NH 25LN and 15LH

In a cubic crystal A atoms are on all the corners and centre of cube 2 B atoms are present on each body diagonal and C atoms are present on all the face centre Find the formula of compound if all the atoms along one of the 3 fold axis of symmetry are removed

Q23 Which of the following reactions produces hydrogen H25208 H O BaO H I OMg H O O Na O 2HCI

Q 34 36 By appropriately matching the information given in th of following table Columns 1 2 and 3 contains radius ratio co ord and shape respectively Column I A 0 732 1 000 I B 0 225 0 414 II 0 414 0 732 C III D 0 1555 0 225 IV a Column II 3 4 6 8 Column III P Octahedral Q Body centered cubic Planar triangular R S Tetrahedral

A X Y3 B X Y3 C X Y D X Y4 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 anion is AIEEE 10 A 144 pm B 288 pm REVISION ASSIGNMENT 01 SOLID STATE 7 C 398 pm D 618 pm 1 5

A unit cell has one atom on each corner of cube and two atoms completely inside the cube at one of it s body diagonals if volume of unit cell is 5x10 24 cm and density of element is 15 gram cm The number of atom preset in 150 gram of element is xx1024 Find x Avogadro number 6x10

A crystal is made up of particles A B and C A forms fcc packing 8 occupies all octahedral voids and C occuples all tetrahedral voids If all the particles along one body diagonal are removed then the formula of the crystal would be 1 ABC 2 A BC 3 A B C

Which positions of lattice are occupied by chloride ions and sodium ions respectively in Rock salt structure Only One Correct Answer A Corners and edge centers B C Octahedral void and corners Corners and face centers

If an ionic solid XY X Y are monovalent ions is doped with 10 2 mole of another ionic solid AY 31 then the concentration of the cation vacancies created is 1 6 023 1019 mol 1 2 60 23 1018 mol 1 3 12 05 x 1021 mol 1 I wt 1205 x 1020 mol 1

Sublimation energy of Ca is 121 kJ mol Also dissociation energy of Cl is 242 8 kJ mol total ionization energy of Ca g Ca g is 2422 kJ and electron gain enthalpy of Cl is 355 kJ lattice energy of CaCl2 is 2430 S kJ The value of AH for the following process is in kJ mol A 355 kJ mol C 355 J mol B 355 kJ mol D 355 J mol

Three atoms A B and C crystallize in a cubic solid lattice where A atoms are present at the body centre B atoms are present at the edge centre as well as at the corners of the cube and C atoms are present at the face centres of the cube Now if all the atoms are removed from the two 4 fold axis and the one 2 fold axis passing through the cube then the formula of the compound is 1 B C 3 ABC 2 AB C7 4 A C

Which of the following is not a problem of ion selective electrodes O Can measure only positive ions Output is influences by ionic strength O O O Interference with other ions O Drift in electrode potential during a sequence of measurements

Which is the incorrect statement 2017 1 Density decreases in case of crystals with Schottky s defect se 2 NaCl s is insulator silicon is semiconductor silver is conductor quartz is piezo electric crystal 3 Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal 4 FeO0 98 has non stoichiometric metal deficiency

A NIST reference material containing 267mgL Fe was analyzed by spectrophotometric and titrimetric techniques giving the results in the table below Analytical technique Titrimetry Number Mean of replicates i 8 Spectrophotometry 10 mgL 249 283 Standard deviation mgL Fe 13 27 Determine whether the techniques can accurately quantify the analyte at the 95 confidence level Explain your reasoning ii Is there a significant difference between the mean and precision of the methods 5 12

PASSAGE Miller introduced a system to designate a plane in a crystal Miller indices group of three numbers that indicates the orientation of a plane or set of parallel planes of atoms in a crystal Read the following passage to answer the give options Marks 1 The miller indices of a plane which intercepts at ab 2 30 OPTIONS 421 361

The N el temperatures of the ortho ferrite perovskites LnFeO3 are listed below Hint These are all orthorhombic perovskites SYC Lecture 4 p25 of the pdf how would you expect this distortion to effect the Fe 0 Fe angle and how will this be effected by changing the tolerance factor Compound N el Temperature K LaFeO3 743 PrFeO3 707 NdFeO3 SmFeO3 EuFeO3 GdFeO3 689 673 662 658 n terms of superexchange explain why FeF3 has a significantly lower N el temperature 200 K than LaFeO3