Solid state Questions and Answers

aliks Solid AB has NaCl type structure If the radius of A and B are 0 5 and 1 5 respectively and formula mass of AB is 48 g mole what is the density in gm cm of AB solid Take Avogadro s number 6 x 1023

A cubical crystal is such that the comers atoms are occupied by P atoms face centers are occupied by Q atoms alternate tetrahedral voids are occupied by R atoms and edge centers are occupied by Satoms Based on this info identify the correct option Multiple options may be correct If there are no defects in the crystal then the formula should be PQ3R4S3 If all the atoms lying on one of the body diagonal are missing then formula should be PQ4Rg 3S4 If all the atoms lying on a line passing conne cting edge centers are missing then formula should be P QRg Rs If all the atoms lying on a line passing through body center and connecting opposite face centers are missing then formula will be PQRS

Q 21 1 If a solid is made up of three different elements X Y and Z then it is found that th voids formed by these elements are found body diagonally in the cubic arrangement Mention th type of voids formed

e Hardy Schulze rule Among Al2 SO4 3 and NH4 3PO4 which is better pagulating agent for a negative sol In the coagulation of negative sol arrange the following in ascending order of their Flocculating power Ba2 Na Al AS2S3 sol is negatively charged Between sodium nitrate and aluminium nitrate which one is needed in larger quantity to coagulate the above sol What in

A metal M having atomic mass 31 25 crystallizes in cubic close packing and it shows Schottky defects If the edge length of the cubic lattice is 500 pm and density of the metal is 1 6075 gm ml then calculate number of moles of metal atom M missing per litre of the crystal Given 1 amu 1 67 x 10 24 gm

tod Vin 1 4000 Pa 2 2000 Pa 3 1000 Pa 4 500 Pa Yor 4 500 Pa 4 An alloy on Zn and Cu i e brass weighs 16 8g in air 44 Zn and 14 7g in water If relative density of Cu and Zn are 8 9 and 7 1 respectively then determine the amount of Zn and Cu in the alloy 1 8 8 g 8 g 2 8 4 g 8 4 g 3 9 4 g 7 4 g 4 9 9 g 5 9 g Ice pieces are fir 10x1 5X1 4 4 14 7g 1 fe 7 1 CHE muy m n 16188 1 8 8 9 8 g Light 2 8 4 g 8 4 g 3 9 4 g 7 4 g 4 9 9 g Ve 211 my

In a Cubic lattice A atoms occupy all corners B atoms occupy all face centers except one position and C atoms occupy the alternate edge centers The simplest formula will be 1 A3B5C2 3 A B C3 2 A B5C 4 AB3C

Following figure shows an FCC unit cell with atoms of radius r marked 1 corner 2 face center 3 face center A quadrilateral is also shown by joining the centers of 4 face centered atoms The distances between atoms 1 2 2 3 and 1 3 A 2r 2r 2 3r C r 2r 2 3r 3 2 B 2 3r 2r r D r 2r 3r

9 In a cubic lattice A atoms occupy the corners B atoms occupy all the face centers except one and C atoms occupy the alternate edge centers The formula of the unit cell is 1 AB 3C 3 3 A B5C 2 AB5C3 4 A B5C3

cations radius r occupy Octahedral holes in the FCC of anions radius R such that there is no distortion in the FCC lattice the perimeter of the shaded region is A 4r 2R C 4r 5R Face centres Rock salt type B 4 r 2R D 4 r R

Metal excess defect due to the presence of extra cations interstitial sites Zinc oxide is white in colour at room temperature On heating it loses oxygen and turns yellow y mg Si Zno heating 1 Zn O 2e 2 2 Now there is excess of zinc in the crystal and its formula becomes 1 xO The excess Zn ions move to interstitial sites and the electrons neighbouring interstitial sites

C60 buckyball is cubic closest packed face centered cubic in its crystalline form If you insert potassium atoms into all the tetrahedral and octahedral holes of the C60 structure the formula would become KC60 What is the value of x A 1 B 2 C 3 D 4

164 A compound is formed by cation C and anion A The anions form hexagonal close packed hcp lattice and the cations occupy 75 of octahedral voids The formula of the compound is 3 C A3 4 C A 2 C4A3 hcp A 1 C3A4 64 1 c OV 6x 3 4 75 100 6 1

A very hard crystalline solid that melts at very high temperature cannot conduct electricity either in solid state or in molten state What kind of crystalline solid is this What type of constituent particles does this solid consist of What is the nature of forces that holds the particles in this solid

A solid has CCP arrangement having atoms A B and C If A atoms are present at face centres B at corners and C atoms occupy 50 tetrahedral voids then molecular formula of solid will be A 80 A3B4C AB3C4 C A4BC3

In hexagonal close packing of sphere in three dimensions A In one unit cell there are 12 octahedral voids and all are completely inside the hexagonal unit cell B In one unit cell there are six octahedral voids and all are completely inside the hexagonal unit cell C In one unit cell there are six octahedral void and of which three are completely inside the unit cell and other three are from contributions of octahedral voids which are partially inside the hexagonal unit cell D In one unit cell 6 tetrahedral voids are completely inside the hexagonal unit cell

b Non stoichiometric cuprous oxide Cu O can be prepared in the laboratory In the oxide copper to oxygen ratio is slightly less than 2 1 Can you account for the fact that it is a p type semiconductor 2

In a non stoichiometric sample of ferrous oxide with NaCl structure the ratio of Fe to Fe wa found to be 0 15 The fraction of octahedral sites occupied by vacancies is A 0 0843 B 0 0923 C 0 0613 D 0 0232

8 Zz In a ccp structure of X atoms Y atoms occupy half of octahedral holes If one Y atom and X atom from each unit cell is replaced by Z then the formula of compound will be 1 X4Y Z 2 X3YZ 3 X3Y Z 4 X3Y3Z In a face centerd lattice of Y and Y Y atoms are present at the corners while Y atoms are at face centers

Which one of the following will have a low heat of fusion 1 a covalent solid 2 an ionic solid Diamond belongs to the crystal system 2 triclinic cubic 3 tetragonal In a simple cubic cell an atom at the corner contributes to the unit cell 3 a metallic solid 4 a molecular s 4 hexagonal

1 86A 2 3 22A 3 If the unit cell of a mineral has cubic close packed ccp array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions m and n respectively are JEE Adv 2015 D 1 1 2 8 2 1 4 3 1 112 22 4 8 JEE Main 2016

4 CI occupy octahedral holes in the lattice The most unsymmetrical system is 1 Cubic 2 Hexagonal 3 Triclinic Schottky defect occurs mainly in electrovalent compounds where 1 positive ions and negative ions are of different size 4 Orthorho

MgU 1 12 0 ions ock salt structure No of nearest neighbour of Mgion are 2 8 0 2 ions 3 6 0 2 ions 4 4 0 ions d 6 If the distance between Na and C ions in NaCl crystal is a pm what is the length of the cell edge 1 2a pm 4 a 4 pm Which of the following expressions is correct in the case of a sodium chloride unit cell edge length a 2 a 2 pm 3 4a pm

2 8 0 ions 3 6 0 ions 4 4 0 ions 1 12 02 ions If the distance between 1 2a pm Which of the following expressions is correct in the case of a sodium chloride unit cell edge length a Na and Cl ions in NaCl crystal is a pm what is the length of the cell edge 3 4a pm 4 a 4 pm d 2 a 2 pm

4 Schottky defects have no effect on the physical properties of solids The edge length of a face centred cubic cell of an ionic substance is 508 pm If the radius of the cation is AIEEE 2010 110 pm the radius of the anion is 1 288 pm 2 398 pm 3 618 pm 4 144 pm du centered packed structure ar

A solid X melts slightly above 273K and is a poor conductor of heat and electricity To which of following categories does it belong 1 Ionic solid 2 Covalent solid 3 Metallic 4 Molecular

Which of the following statements are correct in context of point defects in a crystal 1 AgCl has anion Frenkel defect and CaF has Schottky defects 2 AgCl has cation Frenkel defects and CaF has anion Frenkel defects 2 3 AgCl as well as CaF have anion Frenkel defects 4 AgCl as well as CaF has Schottky defects

In zinc blende structure the coordination number of Zn ion is 1 2 24 3 6 Cesium chloride on heating to 760 K changes into 2 NaCI structure 1 CsCI g In the crystal lattice of diamond carbon atoms adopt 4 8 3 antifluorite structure 4 ZnS structur

AB 2 A B 3 AB For an ionic solid of general formula AB and coordination number 8 for both A and B the value of ra ratio will be 1 less than 0 225 3 between 0 414 and 0 732 2 in between 0 225 and 0 414 greater than 0 732

The empty space in HCP unit cell is 2 47 6 1 74 3 32 The correct statement s regarding defects in solids is are 4 26 JEE 2 JEE 2 and anion

n alloy of copper silver and gold is found to have copper constituting the fcc lattice Silver atoms are occupying the edg entres and gold atom is present at body centre If the alloy has empirical formula Cu AgyAuz find value of x y z

EMISTRY 1 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 1 A4B407 2 AsB607 3 A BSO7 4 A6B8O6

The reaction Quotient Qe for the reaction N2 g 3H2 g 2NH3 g is given as Qc NH3 2 N H The reaction will proceed in forward direction if B Qc Kc Qc Kc Qc Kc

SolveLancer Test How many of the following Lattice systems will have all sides equal 2 Tetragonal 3 Rhombohedral 4 Cubic SolveLancer Tem 1 Triclinic a 1 and 2 b 2 and 3 c 3 and 4 d 1 and 4

8 In zinc blende structure which of the following statements is not correct a Zinc ions occupy half of the tetrahedral sites b Each Zn ion is surrounded by six sulphide ions c Each S ion is surrounded by six Zn ions d It has fcc structure

11 If the total number of atoms per unit cell in an hcp structure and a bcc structure gets halved then ratio of percentage voids in hcp and bcc structures is 1 3 34 27 22 21 2 4 21 22 37 34

3 Water hyacinth 4 Hydrilla 89 3 Mammary alveoli 4 Glandular cells Which of the following in not associated with the secretion of milk in mammary glands 1 Mammary duct 2 Mammary lobes 90 1 Maturation of sperm 2 Energy utilization for movement 3 Sperm motility 4 Penetration into the ovum 91 1 pyro electricity 2 piezo electricity 3 ferro electricity 4 ferri electricity melding 95 Absence of acrosome will affect which activity in a normal sperm The density of KCl is 1 9893 g cm3 an side unit cell is 6 29082 A as deter diffraction The value of Avogadro s m from these data is 1 6 017 x 1023 2 6 023 x 1023 3 6 03 x 1023 4 6 017 x 1019 The phenomenon in which polar crystals on heating produce electricity is called 92 Test Contact Number 9667591930 1 0 668 gcm 3 2 0 585 gcm Lithium borohydride LiBH4 crystallises in an orthorhombic system with 4 molecules per unit cell The unit cell dimensions are a 6 81 A b 4 43 A c 7 17 A If the molar mass of LIBH4 is 21 76 g mol The density of the crystal is 3 1 23 gcm 3 4 None of these 93 The mass of a unit cell of CsCl corresponds to 1 8Cs and Cr 2 1Cs and 6CI 3 1Cs and 1CI 4 4Cs and Cl 94 Which arrangement of electrons ferromagnetism 1 1111 2 1111 3 Both 1 and 2 4 None of these 96 pH of a 0 1 M mono basic is founc osmotic pressure at given temperature T 1 0 1 RT 2 0 11RT 3 1 1RT 4 0 01RT 97 If an iron rod is dipped in CuSO solutio 1 blue colour of the solution turns red 2 brown layer is deposited on iron rod 3 no change occurs in the colour of the 4 none of the above 98 Passage of three faraday of charge solution of AgNO3 CuSO4 Al NO3 deposit moles of metals at the cathode of

An AB solid has CsCl type of structure where A occupies corner If the atoms from corners along one of the body diagonal are removed the formula of a the solid would be 1 A B 2 A B6 3 A B D

88 The y form of iron has fee structure edge length 386 pm and form has bcc structure edge length 290 pm The ratio of density in y form and form is 1 0 848 2 1 02 3 1 57 4 0 6344

Which of the following statement s about Frenkel defect is are true O Some of the lattice sites are vacant An ion occupies interstitial position Some of the cations are replaced by foreign ions Density of the solid remains unaffected

The standard lattice enthalpy of NaCl is AsubH Na 108 4 AH Na 496 AbondH Cl 242 AegH CI 348 6 and AfH NaCl 411 2 All data is in kJ mol O 514 kJ mol 1 O 642 kJ mol 1 O 788 kJ mol 1 927 kJ mol 1

The top surface of a 10 by 10 m horizontal plate is maintained at 25 C and exposed to room temperature at 28 C Estimate the heat transfer Abwm horizontal hooter in ploood in innt 150A DA

The unit cell of an element of atomic mass 108 u and density 10 5 g cm 3 is a cube with edge length 409 pm Find the type of unit cell of the crystal Given Avogadro s constant 6 023 x 1023 mol Comptt Delhi 2012

Atoms A B C and D are presents at corners face centres body centres and edge centres respectively in a cubic unit cell If the atoms touching one of the 2 fold 3 fold and 4 fold axis of symmetry are removed then formula of compound is

27 Find qvibrational for each of the molecules at 675K a 0 2 b CH C CO d H o e CO UPDATE The only other information is that these values may be needed to calculated as well in order to find the answer qtrans V and qrotational This is all of the information given THIS IS A VALUE RELATED TO THE PARTITION FUNCTION THE ANSWER IS NOT THE VIBRATION MODE

e 3 A solid is made of two elements X and Y Atoms X are in fcc arrangement and Y atoms occup all the octahedral sites and alternate tetrahedral sites What is the formula of compound

Which of the following is incorrect about NaCl structure A Nearest neigbours of Na ion is six Cl ion B Na ion make fcc lattice C CI ion pack in cubic close packed arrangement D There are eight next nearest neighbours of Nation

The total number of unit cells present in 80 g of X that crystallises in fcc unit cell is Atomic mass of X is 40 u N 0 2 N 8 N Mark for Review 2 NA

If NaCl is doped with 10 1 mol of SrCl the concentratio of cation vacancies will be 6 02 x 1022 6 02 1020 6 02 x 1023 hr mir 6 02 x 1018

NEET II 2016 1 The percentage of pyridine C5H5N that forms pyridinium ion C5H5NH in a 0 10 M aqueous pyridine solution K for C5H5N 1 7 x 10 9 L 1 0 77 3 0 0060 2 1 6 0 ALL