Solid state Questions and Answers

30 Gold has a face centered cubic lattice with an edge length of the unit cube of 407 pm The diameter of the gold atom is c 352 5 pm d 704 9 pm a 576 6 pm b 287 8 pm 31 The neon atoms has a radius of 160 pm What is the edge of the unit cell of a face centered

a cubic b tetragonal c monoclinic 16 In the primitive cubic unit cell the atoms are present at the a corners of the unit cell c centre of each face of the unit cell 17 In the body contored contored unit gall 1 d rhombohe b centre of the unit cell d one set of faces of the unit cell

15 The crystal system of a compound with unit cell parameters a 0 328 nm b 0 328 nm c 0 527 nm and a y 90 is a cubic b tetragonal c monoclinic 16 In the primitive cubic unit cell the atoms are present at the d rhombohed

unit cell d one set of faces of the 17 In the body centered unit cell the lattice points are present at the a corners of unit cell only b corners and centre of unit cell c corners and centre of each face of the unit cell d corners and at one set of faces of unit cell In the face contored unit noll the lottion n

of unit cell 18 In the face centered unit cell the lattice points are present at the a corners of unit cell only b corners and centre of the unit c c corners and face centres of the unit cell d face centres of the unit cell 19 The effective number of atoms per unit cell in a simple cube face centred cube centred aub

of the 12 edges Fig 2 b It is surrounded by six atoms four belonging to same unit cell 2 on the corners and 2 on face centre and two belonging to two adjacent unit cells Since each edge of the cube is shared between four adjacent 1th of each void belongs unit cells so is the octahedral void located on it Only 4 to a particular unit cell

In an ionic compound A B B2 ions are forming a FCC lattice while A ions are occupying all tetrahedral holes A new compound x is created by doing following sequential structural changes in the compound A B Neglect charge balance 1 Remove anions from the sites other than the corners Place cation c at the sites vacated in the above step Remove A ions alternatively from 50 tetrahedral holes Place D ions at the vacated tetrahedral holes in an unit cell of the final compound X is iii iv The value of number of cati ons number of anions

NH Cl crystallizes in a body centred cubic lattice with edge length of unit cell equal to 387 pm If the radius of the Cl ion is 181 pm diameter of NH4 ion is assume all ions are spherical in shape

Q 33 54 In diamond cubic structure effective number of constituent per unit cell are p and number of voids per unit cell occupied by carbon atoms are q Find value of pxq Answer

arranged shown in Fig 1 10 Fig 1 10 Packing of Nat and Ct ions in sodium chloride It may be noted that in sodium chloride one Nat is surrounded by six CI and vice versa The formula such as NaCl is used to calculate the formula mass instead of molecular mass as in the solid state sodium chloride does not exist as a single entity Thus formula mass of sodium chloride atomic mass of sodium atomic mass of chlorine 23 0 u 35 5 58 5

Cadmium oxide crystallizes in an NaCl type of crystal lattice The compound is however usually non stoichiometric with approximate formula CdO0 95 The defect arising due to some cationic positions are occupied by neutral Cd atom instead of Cd ions and equivalent numbers of anion sites are vacant a What percentage of anion sites are vacant b If the edge length of the unit cell is 470 pm what would be the density of perfect solid c What is the density of non stoichiometric solid

The density of solid Ar RAM 40 is 1 68 g ml at 40 K If the argon atom is assumed to be a sphere of radius 1 5x 108 cm then what of solid Ar is apparently empty space N 6 10 A 35 64 B 64 36 C 74 D None of these

1 SiF 2 ICI 3 SF 4 PCI In a closed packed arrangement A type of atoms are at corners B type of atoms are at face centres Ctype of atoms are at tetrahedral voids and D type of atoms are at octahedral Voids If all the atoms along any one body diagonal are removed then what will be formula of compound 1 AB C D 3 AB C D 2 AB C D 4 None of these 66 1 SiF 2 ICI falfifers A 3 SF O 1 AB C D 3 AB C D 4 PC VER A CR agenerata fuf sementa fuffet fa fam 2 AB C D 4

Li and potassium crystallizes in a body centred cubic lattice with their radii 152 and 230 pm respectively Find the volume occupied by 100 g Li metal in the solid state and the weight of solid potassium present in the volume equivalent to 100 g of Li metal

The edge length of solid NaCl is 563 8 pm and its density is 2 165 g cc Calculate apparent molecular weight of NaCl The difference between the value calculated and the accurate molecular weight is ascribed to a type of crystal defect in which Na atom replaces a number of Nations and equal numbers of anionic sites remain vacant Calculate the percentage of anions site that are vacant

3 An atomic solid crystallizes in a body centre cubic lattice and the inner surface of the atoms at the adjacent corners are separated by 40 pm If the atomic weight of A is 7 calculate the density of solid

Consider the reaction 2CrO H O 2KOH K Cr 012 2H O Potassium peroxy chromate K O Cr 0 0 Cr OK 0 0 Pick INCORRECT statements 1 Oxidation number of Cr changes in the reaction 2 Cr is hexavalent in both reactant and product side 3 Covalency of Cr changes in the reaction 4 Total number of peroxy linkages on reactant and product side is same in the balanced reac 1 2 both O2 3 both O 1 3 both 1 2 3 4 all

a Examine the given defective crystal X Y X Y X Y X Y X Y X Y X e X Y X Y X Y Answer the following questions i Is the above defect stoichiometric or non stoichiometric ii Write the term used for the electron occupied site iii Give an example of the compound which shows this type of defect

Unit cell of a metal has edge length of 288 pm and density of 7 86 g cm Determine the type crystal lattice Atomic mass of metal 56 g mol Define instantaneous rate of reaction Explain pseudo first order reaction with suitable example

In a face centered lattice of X and Y X atoms are presen at the corners while Y atoms are at face centers The the formula of the compound would be if one of the atoms is missing from a corner in each unit cell 1 X Y 24 3 XY 24 2 X24Y7 4 X 4 Y

In a cubic lattice atom X occupies the corn ers of the cube and atom Y occupies the en d centred positions and Z occupies the edg e centres of the cube What will be the simplest formula of the unit cell if one of the face diagonals containing end centre atom is removed

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below BrO 1 82 V BrO 1 BrQ 1 5 V HBrO Br 1 0652 V Br 1 595 V Then the species undergoing disproportionation is NEET 2018 2 BrQ

AH enthalpy of formation of a vacancy is positive OAH enthalpy of formation of a vacancy is negative regarding Entropy of crystal increases due to a vacancy formation More vacancies are formed at a higher temperature

224 A volume of cm hydrogen gas measured at 0 C and 1 atm forms a uniform I 0 16 monolayer at 25g copper The density of liquid hydrogen is area of copper in m g is N 6x10 YOUR ANSWER T g cm The specific surface 4

32 60 hr mit Select the correct statements among following Nearest neighbour distance in NaCl 2 2 Nearest neighbour distance in CaF a 4 3 Nearest neighbour distance in Na O a 3 NIET Nearest neighbour distance in CsCl a

48 49 50 51 1 each face diagonal In face centred cubic lattice tetrahedral voids are present at Question Type Single Correct Type 2 each cube diagonal 3 body centre 52 53 54 55 56 4 each edge centre English Review

In a cubic lattice of XYZ X atoms are present at all corners except one corner which is occupied by Y atoms Z atoms are present at face centres The formula of the compound is XYZ 3 X Y Z 24 X7Y24Z

A copper complex crystallising in a CCP lattice with a cell edge of 0 4518 nm has been revealed by employing X ray diffraction studies The density of a copper complex is found to be 7 62 g cm 3 The molar mass of copper complex is g mol 1 Nearest integer Given NA 6 022 x 102 mol en r

2 54 An element A Atomic weight 100 having bcc structure has unit cell edge length 400 pm The number of atoms in 10 g of A is X 1022 unit cells

4 Lithium has a bcc structure Its density is 530 kg m 3 and its atomic mass is 6 94 g mol Calculate the edge length of a unit cell of lithium metal N 6 02 1023 mol a 527 pm b 264 pm c 154 pm d 352 pm NEET I 2016

Iron ores are dressed by Froth floatation process Magnetic separation Hand picking All of the above

ZnS exists in two crystalline structures i Zinc blende and ii Wurtzite Mark the correct statement about their structures a In zinc blende S2 ions are arranged in ccp while Zn occupy half of the tetrahedral sites In zinc blende S ions are arranged in hcp and Zn ions occupy all octahedral voids b c 2 In Wurtzite structure S ions are arranged in ccp and Zn ions occupy half of tetrahedral voids 2 d In Wurtzite structures S2 ions are in hcp arrangement and Zn ions are occupying all octahedral voids

damon loups c NaCl 2 Which one is called pseudo solid b Glass a CaF d All 3 Solids which do not show the same physical properties in different directions are call h isotropic solids solide

23 The fraction of volume occupied by atoms in a 0 48 b 0 52 24 The fraction of volume occupied by atoms in a 0 32 b 0 480 a primitive cubic unit cell is nearly d 0 68 c 0 55 a body centered cubic unit cell is d 0 74 c 0 68 hy fage contored cubic unit cell is

A solid metal crystallises in ABCABC type closest packing F C C in three dimension If the density of element and it s atomic radius are 5g cm and 100 2 respectively the molar mass in gm mole of element is NA 6 x 1023

a 12 0 b 6 94 44 An element X At mass 80 g mol has fcc structure Calculate no of unit cells in 8 gm of X a 0 4 NA b 0 1 NA c 4 NA d none of these Molybdenum At mass 96 g mol crystallizes as bcc crystal If density of crystal is

INCORRECT statements regarding defects in crystalline solids are Frenkel and Schottky defect are stoichiometric defects Metal excess defect always cause decrease in density of the ionic solid and increase in its electrical conduct Metal deficiency defects always cause increase in density and electrical conductivity of the ionic solids Impurity defects creates cationic vacancies in the ionic solids

At room temperature sodium crystallizes in a body centred cubic lattice with a 4 24 The theoretical density of sodium At wt of Na 23 is A 1 002 g cm C 3 002 g cm 3 B 2 002 g cm 3 D None of these

Corrosion causes damage to carbon bridges iron railings ships etc Corrosion can be prevented by anti rust solution Galvanization is a method of protecting iron from rusting by coating them a thin layer of zinc Brass bronze steel etc are examples for alloys Two or more metals or a metal and a non metal combine and form a new substance is called alloy By making alloy we can increase the substance and Bleaching of coloured objects can be carried out by using chlorine Curfass

In a hypothetical solid A atoms forming CCP lattice B atoms occupy all tetrahedral voids and C atoms occupy all octahedral voids If there is no distortion in CCP lattice then fraction of body diagonal covered up by atoms is

Particle A is present at lattice points of FCC B is present at all octahedral voids C is present at all tetrahedral voids If U is number of particles of B in the nearest vicinity of B and V is number of particles of C in the nearest vicinity of C calculate U V 2

In an CCP crystal of metal M diameter a A we are trying to dope two smaller elements X radius 0 16a and or Y radius 0 25a without disturbing M M contact then select correct matching OBSERVATIONS 1 Density of crystal 2 increases on adding X Packing Fraction 3 remains same on adding X 4 Octahedral voids can have both X Y 1 2 Tetrahedral Void can t have either X or Y 1 REASONS 2 O Voids are bigger than T voids X atoms are heavier than M atoms and size of Unit cell remains same Dimensions of unit cell remain same rx M Question Type Single Correct Type 0 32 Radius ratio of ideal Tetrahedral void

e 1 NaCl structure II ZnS structure III CsCl structure IV CaF structure Il P OV Q P I P Q R S E U edge length of unit cell Distance between two nearest cations a Distance between two nearest cations 11 Distance between nearest cation and anion 4 11 Distance between nearest cation and anion NE lev Distance between two nearest anions 2 2 v3a 2 Distance between two nearest anions 3a Which of the following is correct combination of List and List II

A cubic crystalline ionic solid AB is like rock salt stucture in which B ion is present at body centre If all the ions along one axis passing through opposite face centres are removed then which of the following statements is are correct about resulting crystalline solid A Formula of resulting crystalline solid is A B 1 B Minimum distance between B ion in the resulting crystal is equal to 2 of unit cell C Number of nearest B ion of B ion is 8 in the resulting crystal Percentage decrease in density is 25 times of edge length

In a cubic unit cell atoms A are present at all corner B atoms are present at non adjacent face center and also at edge centers which are not common to the faces containing B atoms at the centres C atoms are present at body centre remaining face centers The formula of give solid can be O O AB C3 AB C2 ABC

SolveLancer Test A compound was used as a solvent in dry cleaning of clothes The compound is a suspected carcinogen and pollutes ground water Which compound has replaced the compound these days SolveLancer Test 1 Liquefied carbon dioxide with suitable detergent 2 Liquefied carbon dioxide 3 Hydrogen peroxide a 1 2 b 2 3 c 3 1 d 1 2 3

8 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 C A3 3 C A 2 C3A 4 CA

A given metal crystallises 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 a 80 pm c 40 pm C b 108 pm d 127 pm 2015 Cancelled

For the ionic compound A3B which of the following statements are correct if radii of A and B ion are respectively 5 x and 2 x and the lattice points have hcp arrangement th of tetrahedral voids are vacant rd of total voids are vacant in compound The coordination number of B is 8 The coordination number of A is 8

Ferric oxide crystallises in a hcp of oxide ions with two out of every three octahedral voids occupie by ferric ions Derive the formula of ferric oxide In a closed packed arrangement there is one octahedral site corresponding to each ato constituting the lattice Therefore number of oxide ions per unit cell in hcp arrangement is 6 Number of octahedral voids 6 1 6 2 6x 4 3 Number of Fe 3 ions 6 x Formula of the compound Fe O 2 or is Fe O3 4 6