The Solid State
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The Solid State
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25 Questions

1. If NaCl is doped with 10-“4 mol% of SrCl2 - the concentration of cation vacancies will be (NA= 6.02 × 1023 mol-“1) [2007]
2. AB; crystallizes in a body centred cubic lattice with edge length equal to 387 pm. The distance between two oppositely charged ions in the lattice is: [2010]
3. A solid compound XY has NaCl structure. If the radius of the cation is 100 pm - the radius of the anion (Y-“) will be: [2011]
4. Structure of a mixed oxide is cubic close packed(c.c.p) . The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is: [2012]
5. In face- centred cubic lattice - a unit cell is shared equally by how many unit cells? [2005]
6. Asolidwith high electrical and thermal conductivity from the following is [1994]
7. The ability of substances to assume two or more crystalline structures is called [1990]
8. Percentage of free space in a body centred cubic unit cell is: [2008]
9. The number of atoms contained in afc c unit cell of amonoatomic substance is [1993]
10. Which of the folloiwng anions is present in the chain structure of silicates? [2007]
11. The number of carbon atoms per unit cell of diamondunit cell is: [2013]
12. Most crystals show good cleavage because their atoms - ions or molecules are [1991]
13. The number of octahedral void per atom present in a cubic close-packed structure is: [2012]
14. The pyknometric density of sodium chloride crystal is 2.165 × 103 kg m-“3 while its X-ray density is 2.178 × 103 kg m-“3. The fraction of unoccupied sites in sodium chloride crystal is [2003]
15. A compound formed by elements X and Y crystallizes in a cubicstructure in which the X atoms are at the corners of acubeand the Yatoms are at the face centres. The formula of the compound is [2004]
16. The intermetallic compound LiAg crystallizes in a cubic lattice in which both lithium and silver atoms have coordination number of eight. To what crystal class does the unit cell belong? [1997]
17. In graphite electrons are: [1993]
18. Copper crystallises in a face- centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm? [2009]
19. Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm - the atomic radius of the lithium will be: [2009]
20. For two ionic solids CaOand KI - identify the wrong statement amongst the following: [1997]
21. Among the following which one has the highest cation to anion size ratio? [2010]
22. Schottky defect in crystals is observedwhen [1998]
23. In the solidstate - MgOhas the same structure as that of sodium chloride. The number of oxygens surrounding each magnesium in MgOis [1999]
24. In the fluorite structure - the coordination number of Ca2+ ion is: [1993]
25. When electrons are trappedinto the crystal in a nion vacancy - the defect is known as: [1994]

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