Solid state Questions and Answers

When NaCl molten is dopped with 10 5 mol of AICI3 what is the concentration of cation vacancies Question Type Single Correct Type 16 02 x 1016 mol 1 2 12 04 x 1017 mol 1 3 6 02 x 1017 mol 1 1016 1

157 A face centred cubic element atomic mass 60 has a cell edge of 400 pm What is its density 3 a 6 2 g cm b 3 c 12 4 g cm d a c 3 158 A substance has a density of 1 984 g cm m3 and it crystallises in the face centred cubic crystal with edge length equal to 630 pm The molar mass of the substance is 37 35 g mol 74 69 g mol a 2 a a 24 8 g cm 3 3 1 g cm 59 In a bcc structure the minimum distance between any two atoms is 3 3 b 56 02 g mol d 65 36 g mol d b 2a a

162 Potassium has a bcc structure with nearest neighbour distance 4 52 Its atomic mass is 39 Its density will be a 454 kg m c 852 kg m 3 3 b 804 kg m d 910 kg m 3 b d 3 63 A metal crystallises in fcc and bcc The ratio of the densities in two phases is 1 259 If edge length in fcc is 3 5 what is the edge length in bcc a 3 0 4 4 c 4 5 2 5

atom is approxima a 1 86 A c 5 72 39 If the unit cell of a mineral has cubic packed ccp array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holed occupied by magnesium ions m and n respectively 14 are a INFIN 2 b 3 22 d 0 93 c 2 2 b 1 4 1 2 4 118 4 8 149

74 In a FCC unit cell if half of the atoms per unit cell are removed then percentage void is 52 68 Tark for Review 6 3 hr

27 In a compound atoms of element Y form ccp lattice and those of element X occupy 2 3rd of tetrahedral voids The formula of the compound will be a X 3Y4 c X2Y3 x b X4Y3 d X Ybaloz a ni 28 Copper crystallises in fee with a unit call length of 361 q 2

Identify the incorrect statement hr min At room temperature KCI has NaCl type structure At high pressure the structure of KCI changes to CsCl type structure High pressure increases the co ordination number At temperature about 760 K NaCl structure changes to CsCl type structure

Which of the following is an incorrect statement regarding Frenkel defect O Also called as dislocation defect O Density remains same O Entropy of the solid decreases O Large difference between size of ions

Which of the following is an incorrect property of amorphous solids Do not have definite heat of fusion Isotropic in nature True solids When cut with a sharp edged tool they cut into two pieces with irregular surfaces

In a ccp structure of X atoms Y atoms occupy half c octahedral holes If one Y atom and X atom from each unit cell is replaced by Z then the formula of compoun will be 1 X4Y2Z2 3 X Y Z 2 X3 YZ 2 4 X Y 7

If in a solid AB of NaCl type radius of cation A is 50 pm then the maximum radius of anion B will be 120 8 pm 68 3 pm 128 2 pm hr m 20 7 pm

C 110 A two dimensional solid pattern formed by two different atoms X and Y is shown below The black and white squares represent atoms X and Y respectively The simplest formula for the compound based on the unit cell from the pattern is a XY 8 c XY b X Y d XY

1 9 x 10 gm of the metal having density 19 gm ml is dispersed in one litre of water to give a sol having spherical metal particles of radius 10 nm The approximate number of metal sol particles per cm of the sol is given by 1 2 35 10 3 1 9 10 2 4 x 10 0 4 2 8 10

7 3 Total order of the reaction is 4 4 Order of the reaction with respect to B is 1 For a reaction consider the plot of ln k versus 1 T given in the figure If the rate constant of this reaction at 400 K is 10 5 s 1 then the rate constant at 500 K is In k 1 T 1 2x10 4 S 1 3 10 6 s l slope 4606K 2 10 45 1 4 4x10 4 s

A metal crystallises in simple cubic lattice with edge length of 400 pm Molar mass of the metal is 60 g mol 1 The density of metal will be NA 6 x 1023 atoms mol 1 1 32 g cm 3 1 56 g cm 3 2 12 g cm 3 1 91 g cm 3

Electrolytes are hydrated to different extent size of the ion is the deciding factor The radius of a water molecule assuming a spherical shape is approximately 1 40 Assume that water molecules cluster around each metal ion in a solution such that the water molecules essentiall touch both the metal ion and each other On this basis and assuming that 4 6 8 and 12 are the onl possible coordination numbers and size of cations as Mg2 radius 0 65 Rb radius 1 48 16 Al radius 0 50 Sr radius 1 13 Maximum number of water molecules that can hydrate Mg ion is A 4 C 12 B 6 D 8

40 In the ionic compound AB the ratio r r is 0 414 Indicate the correct statement of the following a Cations form close packing and anions exactly fit into the octahedral voids b Anions form close packing and cations occupy precisely half of the tetrahedral voids c Anions form close packing and cations occupy precisely all the octahedral voids d Anions form close packing and cations fit into the octahedral voids loosely

0 10 sites of catalyst bed have adsorbed by H On heating H gas is evolved from sites and collected at 0 03 atm and 300K in a small vessel of 2 46cm B 2 D None of these A 1 93 616

Physical Chemistry Q15 The number of fifth nearest neighbor atoms in the FCC lattice at the distance respectively All the distances given below is in under root 12 and 3 12 and 2 12 and 1 5 2 24 and 2 5 4

In the crystal of solid x A ions are present at each of the corner and B ions are present at each of the face centre of a cubic unit cell Whe 0 6 gm of the above solid is dissolved in 100 gm of water solution showed freezing point of 0 2976 C The solute x is assumed to be 205 dissociated in aqueous solution and Kf of H O is 1 86K kg mol 1 Now select the correct option s Assume tha TA3 0 414 TB 1 0 and assume element A exists in 3 and 4 oxidation state and Avogadro s number 6 x 1023 Molar mass of x is 60g mol Density of x is 1 25g cm Total number of unit cells of x in solution are 6 x 1021 If the defected solid is found to contain 12 cation vacancies then of A4 ions in its crystal is 40 90

The body centered cubic cell of chromium has a length of 0 288 nm Calculate the density of chromium g cm Atomic weight Cr Cr 52 0 Question Type Single Correct Type 1 6 80 2 7 60 3 6 60

How does solid state differ from the other two states Answer with referenc to volume shape effect of temperatur and pressure on these and the motion of constituent particles and interparticl forces

1 For real gases van der Waals equation is written as an P V2 der Waals constants Two sets of gases are I O CO H and He II CH4 O and H The gases given in set I in increasing order of b and gases given in set II in decreasing order of a are arranged below Select the correct order from the following nb nRT where a and b are van a I He H CO O II CH4 H O b I O He H CO II H O CHA c I H He O CO II CH4 O H d I H O He CO II O CH H

Homogeneous catalysis implies that A Reactants and products must be in the same phase B C Reactants and catalysts must be in the same phase Composition of the reaction mixture must be homogeneous throughout D Products and catalysts must be in the same phase

The figures given below show the location of atoms in three crystallographic planes in a fcc lattice Draw the unit cell for the corresponding structures and identify these planes in your diagram 2000 ooo 88 L OOO Secadun alto elea yow yood tolle d

water condense to cubic Intercepts of a plane in crystal is given by a b 2 3c in a simple cubic unit cell The miller 14 Sep 2020 Shift II indices are a 132 b 261 c 123 d 361

2 Calculate how many Buckminster fullerene have edge from a square graphene layer of 100 nm side length 3 nm can be produced SAEUM 00

21 Determine the percent of water in the original sample of a hydrated salt Salt g Heating Time min 10 0 0 0 9 1 5 0 8 0 20 0 8 0 60 0

Iron has a body centered unit cell with a cell dimension of 286 65 pm Calculate the density of iron in g cm 1 pm 10 m

he unit cell for cobalt II selenide is shown below What is the formula of this compound Co Se

The melting point of various ratios of mixtures of urea and acetaminophen were determined and the Results are shown below in Table 1 Plot a graph of the data Table 1 Effect on mp of mixing two compounds Urea Acetaminophen mp Your task 100 0 131 133 80 20 120 122 60 40 40 60 110 112 130 132 20 80 148 150 0 100 169 171

5 If the density of tin is 7 26 g cm what is the thickness of a piece of tin foil that measures 5 00 cm by 5 00 cm and has a mass of 2 722 g optional A lead hall has a mass of 5 910 g and a diameter of 10 0 mm What is the den 213

Gold which packs to form face centered cubic unit cells has a density of 19 3 g cm and an atomic radius of 144 pm Calculate a hypothetical density of gold if it formed a simple cubic unit cell instead Edit Format Table

Calculate the density of a hypothetical form of zinc metal consisting of body centered cubic unit cells The radius of a zinc atom is 122 pm O 7 71 x 10 8 g cm 9 71 g cm 7 71 g cm O 0 103 g cm Question 13 1 pts

Assuming all spheres have equal radii and are close packed in two dimensions The correct relation between the packing fractions of the structure given below is O n O n n n n3 On n n3 n2 n n3 n n n3 n n

The atomic radius of metal X is 1 30 x 10 picometers pm and a crystal of metal X has a unit cell that is face centered cubic Calculate the density of metal X atomic weight 42 3 g mol density g cm

A metal crystallizes in the face centered cubic FCC lattice The density of the metal is 19320 kg m and the length of a un cell edge a is 407 83 pm Calculate the mass of one metal atom mass Incorrect Identify the metal copper nickel gold

5 LT 7 1 B Name Which particie diagram below best represents each chemical formula below 1 2 3 11 38 a b LICN s NaOH aq K S aq What type of reaction is this a synthesis What type of reaction is this a synthesis After B BaF s Ba aq 2 F aq b precipitate c decomposition b precipitate Ca LTE Which of these is true about dissociation a Water molecules break apart into H and O atoms b A solid breaks apart and the particles become individual ions c individual ions join together to form solids d Spectator ions form a precipitate Which of the following pictures show precipitation Hr D d dissociation aq 2 Cl aq CaCl s c decomposition d dissociation

The covalent bonds between atoms that hold the molecule together are called forces 11 6 C s 3 H g CH g involves The chemical bonds between atoms or ions are intermolecular forces between molecules If C H NO s CH NH 1 and N O g are all at 25 C the substance with the lowest average 10 4 kinetic energy is N O is a gas at 25 C because it has CHNO s and C H NH 1 and its kinetic energy 2 6 5 the attractive forces between its molecules than Fill in the blanks by selecting one option from each menu aby Part 1 2 points aby Part 2 2 points aby Part 3 2 points ab Part 4 2 points ab Part 5 2 points ab Part 6 2 points 12 points overcome the attractive forces

Identify the cubic crystal structure being represented by the following unit cell

A solid calcium boride CaBx has a density of 2 45 g cm It has a primitive cubic lattice with an edge length equal to 415 pm and with one calcium atom per unit cell What is the value of x 1 pm 10 12 m 02 O 1 06 8

A first order n 1 reflection from the plane of a cubic crystal was observed at a glancing angle of 11 2 when Cu Ka X rays 154 pm were used What is the interatomic distance between the atoms in the unit cell in pm

point The mass number of an isotope is the number of neutrons in the isotope True False 00

Solid AB has ZnS type structure with B ions at corners If all ions presents in the plane as shown in figure are removed then empirical formula of final solid CANNOT be O A3B2 O A4B3 A3B4

Steel is an alloy consisting of Fe with a small amount of C Elemental Cr can be added to steel to make the steel less likely to rust Cr atoms react with oxygen in the air to form a nonreactive layer of chromium oxide on the surface of the steel preventing the oxidation of underlying Fe atoms A sample of steel chromium alloy contains 15 percent Cr by mass Which of the following diagrams best shows a particle level view of a surface section and an interior section of the alloy represented below at the left The atomic radii of the atoms involved are given in the table below at the right Surface Fel Fe Interior Element Fe Cr C O Molar Mass g mol 55 85 52 00 12 01 16 00 Atomic Radius pm 125 127 77 73

The conductivity of intrinsic semiconductors such as silicon and germanium can be increased when small amounts of group 3A or group 5A elements are added a process called doping The resulting semiconductors are called either p type or n type semiconductors Classify the type of doping condition and diagrams depicting the electron population of molecular orbital energy level bands as p type or n type semiconductors p type semiconductor n type semiconductor

Batman and Superman each performed a reaction using sodium hydroxide as a reactant Batman used a new supply of sodium hydroxide while Superman used an older container of sodium hydroxide with a broken seal Predict how the theoretical yield actual yield and percentage yield for each of these two reaction will compare to one another assuming all other factors are the same 2 marks

Consider the simple cubic primitive cubic unit cell shown in this image How many atoms are shown in the image atoms in image What fraction of each atom is inside the boundaries of the cube

Copper atoms and zinc atoms have the same atomic radius 135 picometers Based on this information which of the following diagrams best represents an alloy containing only copper and zinc atoms 0 0 0 0 0 0 000 2 0 0 0 0 0 0000000 2000 O 00 00 T 0 0 0 0 2 0 0 0 C I

Gold has a density of 19 3 g mL Calculate the radius of an Au atom expected if gold crystallizes in the face centered cubic structure O 747 pm O 144 pm O 100 pm O 360 pm