Page 1 :
“, , , , , , , GB, — — — MODERN'S abe OF CHEMISTAY-jy, z —, C87, The crystal with metal deficiency defect is C46. AB crystallizes i ., , (a) NaCl () FeO longth ‘a’ equal to. ae anon “a, @ KCl (@) ZnO oppositely charged ions in the Inttice in men eg, , (e) LiCl (Kerala P, (a) 200 pm (6) 300 pm, , {c) 336 pm (@) 250 pm, , , , C38, Which one of the following compound ex!, Schottky and Frenkel defects ?, (a) NaCl (6) AgCl, fc) AgBr (d) Agi, (K.C.E.T. 2010, A.M.U. Med. 2010), C39. Relationship between atomic radius (r) and the edge, length a of a body centred cubic unit cell is, , @ r=$ (6) r= f, 2 2, @ rt 4, (d) r= “ (LK, C.E.T. 2010), C40. Which of the following is a molecular crystal ? (a) Rock aalt (6) Quarts, (c) Dry ice (d) Diamond, , (Karnatka C.E.T. 2010), , C41. A solid is formed by two elements P and Q. The element Q, forms cubic close packing and atoms of P occupy two-third, of tetrahedral voids. The formula of the compound is ?, , (a) PQ, (6) P,Q, (©) P,Q, (@) PQ, (AM.U. Med. 2010), C42. Given :, eee Colum A Column B, A Ionic solid I NaCl, ~~ B-..Metallie soild ui Fe, C Covalent solid Il C (graphite), D = Molecular solid TV Dry ice, Which of the following is correct ?, , (a) A-U, B-I, C-1V, D-TIT, (8) A-I, B-II, C-Ill, D-IV, (®) A-IU, B-U, C-I, DIV, (@) ATI, B-IV, C-I, D-IT (Orissa J.B.B. 2010), f* The edge length of a faco 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 :, (a) 618 pm (6) 144 pm, (c) 288 pm (@) 398pm (ALEEE, 2010), C44. Percentage of free space in cubic close packed structure, and in body centred packed structure are respectively :, (a) 32 % and 48 % (b) 48% and 26%, , 26% (d) 26% and 32%, () 30% and (ALBEE. 2010), , , , , , , , , , (CBSE. PMT,, C47. In zine blende structure, the coordination number on, , cation ia, , fa) 4 (6) 6, , @ 8 @) 12 (1K. CET. 2014), C48, CsCl has co-ordination number ratio, , (a) 6:6 (6) 8:8, , (eo) 4:4 (@) none of these, , (Odisha JRE 2011), , C49. For co-ordination number-4, the maximum limiting radius, , ratio is, , (a) 0.414 (6) 0.732, , (ce) 0.225 (d@) 0.155 (Odisha JEE 201)), , C50. Radius ratio of an ionic compound is 0.93, The structure of, the above ionic compound is of, , (a) NaCl type (6) CaCl type, (e) ZnS type (d) none of these, (Odisha JEE 2011), , C61, Ina face centred cubic Inttice, atom A occupies the corner, positions and atom B occupies the face centre positions. If, one atom of B is missing from one of the face centred, points, the formula of the compound is, (a) A,B (6) AB,, © A,B, (@) A,B, (AIEEE 2031), , C52. Copper erystallises in fee lattice with a unit cell edge of, 361 pm. The radius of copper atom is :, , (a) 108 pm (6) 128 pm, , {e) 157 pm (d) 181 pm (AIEEE 2011), C53. Co-ordination number of cations in rock salt structure of, , NaCl is:, , (a) 4 (b) 6, , (c) 8 @ 9 (Odisha J.E.E, 2012), C54. Percentage of free space in dee lattice is :, , (a) 24 (6) 32, , (ce) 48 (@) 52 (Odisha J.E.E. 2012), C55. The empty space in the body centred cubic lattice ix:, , (a) 68% () 52.4%, , {c) 47.6% (a) 32%, , (e) 74% (Kerala P.M.T. 2012), , Molecule/ion, , 5, The packing efficiency of the two dimensional square unit Magnetic property, cel] shown is t @) CoH, (1) Antiferromagnetic, (@) 39,27 % (i) Cr, (2) Ferrimagnetic, (b) 68.02% Gii) MnO (3) Forromannanl, i 50% C) (LT. 2010) Gre. Ba () Paramagnetic, ° (v) Fe* (6) Diamagnetic, to M.C.Q., C37. (b) C88.) C39. (ce) C40. (e) CAN. (c) C42. (6) CAB. (6) C445) C45. (ct) CHB. (@), C47, (a) C48, (6) C49. (a) C50. (6) C51. (d) CBB. (b) CBB. (6) C54. (6) C55. (a)

Page 2 :
PBA, , fa) 288 pm th) 408 pm, , (ce) 144 pm (d) 204 pm = (A,LPM.T. 2012), C61, Lithiurn forme body centred cubic structure. The length of, , the side of ite unit cell ia 251 pm. Atomic radius of the, , lithium will he, , (©) ied, i866, tiie, iv-2, vd (Kerala P.E.T, 2012) (2) 200 pm (b) 240 pm, C57. Amotal crystallises into a lattice containing a sequence af (oc) 152 pm (d) 15 pm ALEEE. 2012), layers of atoms of ABABAR.......Whatis tho percentage 62. A compound MpXq has cubic close packing (ccp), by volume of this lattice having empty space ? arrangement of X. Its unit cell structure ix shown below., (a) 74 (b) 26 Tho empirical formula of the compound is, (©) 20 (d) 16 [A.MLU. (Mecl.) 2012], C58. Total number of metal atoms por unit call in a face centred, cubic lattice is :, (a) 14 () 8, () 6 (d) 4 (LK. C.B.T, 2012), C49. The number of octahedral void(s) per atom present in a, cubic close-packed structure is, (a) 1 (bh) 3, () 2 (d) 4 (ALP.M.T, 2012), , , , C60. A metal crystallises with a face-centred cubic lattice. ‘The, edge of the unit cell is 405 pm. The diameter of the metal, atom is (a) MX (6) MX,, , (c) MyX () MiXiq, i (LLT. SEE. 2012), , , , C56. (c) C57. (6) C58. @) C59. (a) C60. (a) CBI. (c) = COZ. (8), , , , — — — $$$, SPECIA Answer the following questions :, , M.C.Q. ser: E 7 Di. ‘The number of atoms per unit cell in simple (s), body, , based on the given passage/comprehension centred (5), face centred (f) and end centred (¢) unit cell, , decreases as, , >b>e> “f>bre>s, The crystalline solidshave definiteorderlyarrangementot i a ce oe = Soaaeas, ; : oe ee eae, ae rosie on mat Sere ie Loa D2. Gold crystallizes ina face centred unit cell. Ita edge length, as unit cell, The unit cells are described as simple (paints is 0.410 nm, The radius of gold atom is, , Passage |., , “ar all the corners), body centred (points at all the corners {a} 0.205 nm (b) 0.290 nm, , andinthecentre), face centred (points at all the corners and fe) 0.145 nm (d) 0.578 nm, , centre of all faces), and end centred (points at all thecorners D3. In ncubic lattice of XYZ, X atoms are present at all corners, and centres of two opposite end faces) unit cells. In two except one corner which is occupied by ¥ atoms. Z atoms are, common types of packing cep and hep, 26% of space is left present at face centres. The formula of the compound is, unoccupied in the form of interstitial sites. For the stable (a) X,YZ., (b) XYZ,, , ionic crystalline structures, there is definite radius ratio (©) XYZ (@) XYZ,, , limit for a cation to fit perfectly in the lattice of anions,, called radius ratio rule. This also defines the coordination, nurmberofanion, which isthe number ofnenrest neighbours, of opposite charges. This depends upon the ratio of radii of, , D4. The ionic radii of K*, Rb’ and Br“ are 137, 148 and 195 pm., The coordination number of cation in RbBr and KBr, structures are respectively, , i is rati inati (a) 8&6 (d) 64, , fons, r,/r_, This ratio for coordination numbers, radon 6 "und 8 is respectively (ce) 6,8 (@) 4,6, 0'166-0.226, 0.225-0.414, 0.414-0.732 and 0,782-1 D5. A face centred cubic lattice ofa metal M and a body centred, , respetively, The coord, , , , , ination number of ionic solids also cubic Lattice of metal N contain same tuumber of 2.25 x 107, , unit cells. If density of M is twice than that of N, the ratio, between the number of atoms per unit cell is, , fa) 4:1 (b) Ask, ) 251 (dy asd