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14. In which par nest efficient paching is present?, (a) ho and bce, (b) Acp and ce, (c) b and cep, (d hee and simple cubic cell!, 15 Waich of the following sta.crcnt is not true about amorphous solids?, (a) On heatiag they may beconme erysta!line at certain temperature., (b) They may become erystailine on keeping for long time., (ci Amorphous solids can be aoulded by heating., (d They are anisotropic nature., Section B: Assertion and Reason Type, Note: In the following quest.ons a siatement of assertion followed by a statement of reasun is gn en. Choose the, correct answer out of the following choices., (a, Assertion and reason hoth are correct.statements and reason is correct explanation ior as sernion., (b) Assertio and reasen toth are correct statements but reasen is not correct explanation for assertion., (c) Assertioa is correct suctement but reason is wrong statement., (d, Assertion is wrong statement but reason is correct sta'ement., 16. Assertion : The total mumber of atoms present in a simole cubic unit cell is one., Reason: Simple cubie init cell has atoms at ts comers, each of which is shared hetween cigat adjacent unii cells, 17. Assertion : Graphite is good conductor of electricity however diamond belongs to the category of insalator, Reason Graphite is sofl in nature on the other hand diamond is very hard and brittle., 18. Assertion: Total number of octahedral voids present in unit cell of cubic close packing including the one that is, present at the body centre. is four., Reason: Besides tne bedy centre there is one octahedral void present ar the centre of each ef the six faces of the unil, cell and each of which is shared between two adjacent anit cells., 19. Assertion :A tetrahedral void is surrounded by four spheres and an octahedral void is surrounded by six spheres.., Reason : The number of tetrahedral voids is double the number of close packed spheres aad number of octaiedral, voids is equal to number of close packed spheres., 20. Assertion : Frenkel defect is also called dislocation de éct., Reason: Frerkel defect is shown by ionic substances in which cation and ation are of almost similar sizes.

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SECTION A: Single Correct Aaswer Type, Which of the following is an amionphous solid?, (a) (iraphite (C), Which of the following is a nerwark solid?, (hi Quartz glass (SiO,), (c) Chronte alum, (d) Silicon carbide (siC), (a) SO, (Solid1, (bi Is, (c) Diamond, (d) H-O (lce), 3. Giraphite cannot be classificd as, (a) conducting solid, 4. Cations are present in the interstitial sites in, (h) network solid, (c) covalent solid, (di ionic solid, (a) Frenkel defect, (by Schottky defect, (d) Metal deliciency delect, (c) Vacancy defeci, 5. Schottky defect is observed in crystals when, (a) some calions move from their lattice site to interstitial sites., (b) equal number of cations and anions are missing from the lattice., (c) some lattice sites are occupied by electrons., (d) scne impurity is present in the lattice., 6. Which of the following point defects are shown by AgBr(s) crystals?, (A) Schottky defecti, (C) Metal exNcess defect, (B) Frenkel detlect, (D) Metal deficiency defect, (c (A) and (C), (a) (A) aad (B), (b (C) and (D), (di (B) and (D), 7. A rietal X crystallises in a fiace-centred cubic arrangement with the edge length 862 pim. What is the shoriest separation of, any twe nuclei of the atom?, (a) 406 pm, *What is the coordination mber in a square close packed structure in two dimensions?, () 2, (b) 707 pm, (e) 862 pm, (d) 609.6 pam, Ibi 3, (c) 4, (d) 6, The correct order of the packing efficieney in different types of unit cells is, (a) fee < bec < simple cultic, (e) fee shee> simple cuisie, 10. The edge lengths of the unit cells in terms of the radius of spheres constituting fee.he and simple cobic unir cell are, respectively, 9., (b) fce bee> simple cubic, (d) bee <fee simple cubic, 4r, (a) 2v2r,. 2r, (e) 2r, 2v2r,, 47, (b)2VZr, 2r, 4r, 2r,, 11. Which of tlie following is nat true about the ionic solids?, (al Bigger ions form the ciese packed structure., (b) Snaller ions occupy eitlier the teirahedral or the octahedrai voids depending upon their size., (c) Occupation of all the voids is not neressary., (di The fraction of octahedral or tetiahedra! voids occupied depends upon the radii of the ions occupying the voids., 12. Iu the cubic close packing he unit celi has, ta d retralicdral voids each of which is slhared by four adjacent unit cells., thì tetrahedra! voids withyn the unit cell., (c) tetraliedeat voids cach of the which is shared by four adjacent unit cells., (d) Stetrahedral voids within the unit cells., 13. The total number of tetraitedral voids in the face ventied unit cell is, (hi S, (a) 6, te) 1o, (da12