Answer the question number 3

Answer the question number 3 CRASH COURSE INSTITUTE PICS - IMPORTANT QUESTION BANK CHEMISTRY PHYSICAL CHEMISTRY-XII THE SOLID STATE an With Which silicon Can be doped to give a p •type semiconductor. 2 _ Why iS Salt SonwtinwS yellow of white? 3. What makes alkali metal halides Sometimes colored which are otherwise colorless? 4. iS the effect of *hottky defects on the density of Solids? 5. What is Curie 6. Which stoichiometric defect result in incrmse in density?? 7. the non stoichiometric point defect responsible for alkali 8_ Why iS considered a super Cooled liquid 9. What iS a Soniconductor? two main types of Semiconductors. giv"mg examples, 10 Explain added as an impurity in it trodmW ionic Solid Catinof is II. What type Of substances make better ferromagnetic or Justify MSwer 12 Assign reason Why Of the Very Old objects oppar Slightly milky Of An element crystallizes in a Structure fcc unit cell with length of 200 its density. if 200 g Of this element contains 24 XIOB atoms 14 The of unit cell edge Of body Centu•ed 'rætal crystal is 352 the radius of an of metal 15, An elenent (zz60) face cmtered cubic unit cell has of 6.23 glans , What is edge of unit cell, 16 State the difference frenkeJ defects. Which Of the TWO Changes the density of the Solide IT An element crystallizes in the Simple cubic Structure density is 8 g/cn3 and its 200 g cmtainS 24xlO the edge 18. is the of octahedrul void? Which of the has the highest packing efficiency • (i) FCC (ii)BCC (iii) Simple cubic 19 of elenwnt g form t'wse of A 2 / 3rd of tetrahedral voids _ What is the formula Of the compound formed by these elements A and 20. W'wt o glass different from a Solid Such as conditions could qw•tz be converted iMo glass? 21 What is semiconductors *Describe n•type Of . giving examples 22. Conductivity of is enhanced by the introduction of *Chas the impurity Why? 23. What is the eff&t of temp. electrical Conductivity Of Conductors and semiconductors. 24. 26. 27 _ 30. What are 12-16 and 13-15 Explain, W"wt anisotropic isotropic So lids? Why is glass considered as a cooled liquid? You'& Why does zinc oxide exhibit enhanced electrical conductivity on f errinvætism. Wiwt do defects. nonstoichiometric defuts and defects? Analysis Shows Nickel oxide What fractions Of nickel exist as N" ions Nin ions?

Dear Student,

When halide ion of alkali metal halides are missing from lattice causes a hole leads to F-centres which absorbs white light from the surroundings and forms colour in emission process. Hence alkyl halides forms colour during excitation and no colour in ground state.

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