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CBSE Class 12 Question Bank 2023 : Chemistry

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Arsha Mohanan
Kendriya Vidyalaya (KV)
xii science

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QUESTION BANK CHEMISTRY CLASS-- XII CHAPTER 1 Q.1 Q.2 Q.3 Why is Frenkel defect defect not found in pure alkali metal halides? Although Si is an insulator, then how does it behave as semiconductor upon heating ? In the mineral Spinel having the formula MgAl2O4, oxide ions are in ccp arrangement, (a) What percentage of tetrahedral void is occupied by Mg 2+ ions? Q.5 Q.6 Q.7 (b) What percentage of octahedral void is occupied by Al 3+ ions ? A compound is formed by two elements M and N. The element N forms ccp structure and atoms of M occupy 1/ 3rd of tetrahedral voids. What is the formula of the compound ? Ionic solids, which have anionic vacancies due to metal excess defect develop colour. Explain with the help of a suitable example. The edge length of unit cell of a metal having molecular weight 75g/mol is 5A which crystallises in cubic lattice. If the density is 2 gcm 3 ,then find the radius of the metal atom ( N A = 6 10 23 ) . Give the answer in pm. Q.8 Q.9 How will you distinguish between the following? (i) Hexagonal close packing and cubic close packing. (ii) Crystal lattice and unit cell. (iii) Tetrahedral void and octahedral void. (i) What type of substances exhibit antiferromagentism? (ii) How does doping of NaCl with SrCl 2 changes its structure? (iii) Some of the glass objects recovered from ancient monuments look milky instead of being transparent. Q.12 (a) Explain the following giving suitable examples : (i) Mode of conduction in n type semiconductors and p type semiconductors. (ii) Anisotropy in crystalline solids. (b) Calculate the packing fraction in fcc structures. (c) In terms of band theory, what is the difference between a conductor and an insulator? ******

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CBSE Class 12 Question Bank 2023 : Chemistry
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