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THE BEST ACADEMY, UDYAVARA, CET/ JEE / NEET EXAM: 2021-22, Sub: CHEMISTRY TOPIC: SOLID STATE, The substance that does not have sharp melting point is, a) KCl b) Glass c) Ice d)Diamond, , . Which one of the following is a molecular crystal?, , a) Rock salt b) Quartz c) Dry ice d) Diamond, , 3. Which one of the following is a covalent crystal?, , a) Rock salt b) Ice c) Quartz d)Dry ice, , . Unit cell dimensions of tetragonal crystal system, , a)a=b=canda =f =y = 90° b)at#b#c&a=B=y=90", c)a=b# canda =f =y =90° d) a=b# cand a =f = 90" andy = 120°, , . Asolid XY has NaCl structure. If radius of X* is 100pm, what is the radius of Y- ion?, , a) 120 pm b) 136.6 to 241.6 pm c) 280 pm d) Unpredictable, , . Inaface centred cubic arrangement of A and B atoms whose A atoms are at the corner of the, , unit cell and B atoms at the face centres , one of the A atom is missing from one corner in unit, cell. The simplest formula of compound is, a) Ar Bs b) ABs C) AvBas d) AzjeBs, , . Aluminium crystallises in c.c.p. structure. Metallic radius of aluminium is 125pm. Edge length of, , the unit cell of aluminium is, a) 250pm b) 353.5pm c) 176pm d) 216.5pm, , . Sodium metal crystallizes in b.c.c. lattice with cell edge of 4.29 A®. the radius sodium atom is, , a) 2.145 A® b) 1.86 Av c) 1.315 A® d) none of these, , . Schottky defect is observed in crystal when, , a) Some cations move from their lattice sites to interstitial sites., b) Equal number of cations and anions are missing from the lattice., c) Some lattice sites are occupied by electrons., d) Some impurity is present in the lattice., . The crystal system of a compound with unit cell dimension a= 0.387nm, b= 0.387nm and c=, 0.504nm and a= 6 = 90° andy =120° is, 1) Cubic 2) Hexagonal 3) Orthorhombic — 4) Rhambohedral, . Which of the following FCC structure contains cations in alternate tetrahedral voids?, 1) NaCl 2) ZnS, 3) Na20 4)CaF2

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12. A metal has a fcc lattice. The edge length of the unit cell is 404pm. The density of the metal is, , 2.72g/cm*.The molar mass of the metal is, 1) 27g/mol 2)20g/mol, 3) 40g/mol 4)30g/mol, 13. When NaCl is doped with 1.0x 10-? mole of SrClz, the number of cation vacancy is, 1) 6.023x10" 2)6.023x10”, 3)2x 6.023x10 29 4) 3.011x10%, , 14. The radius of a divalent cation M2- is 94pm and of divalent anion X2- is 146pm.Thus M2- X2 has, 1) Rock salt (NaCI) structure, 2) Zinc blende structure, 3) anti -fluorite structure, 4) BCC structure, , 15. The radius of the Na*is 95 pm and that of Cl ion is 181 pm. Predict the co-ordination number of, Na*, a) 4 b)6 cs d) unpredictable