Unit 1. SOLID STATE Q.1)Name the types of three dimensional packing normally found in cubic crystals ? Ans)There are normally three types of packing. these are simple, face centred and body centred. Q.2)What is C.N. of each sphere in a body centred close packed structure ? Ans)The CN of each sphere is 8. Q.3)What is the maximum number of atoms in a HCP crystal structure of an element ? Ans)It is twelve (12). Q.4)What is the C.N of Ca2+ and F in CaF2 crystal lattice ? Ans)C.N of Ca2+ion=8, C.N. of F-ion= 4 Q.5)How many particle are present in face centred unit cell? Ans) Four particles are present in each unit cell. Q.6)How many atoms are there in unit cell of a metal crystallizing in FCC structure ? Ans) Four. Q.7)How many faces are there in a cube ? Ans) Six. Q.8) A compound AB2 possesses the CaF2 type crystal structure. Write the coordination number of A2+ and B-ions in its crystals? Ans)Coordination no. of A=8,Coordination no. of B=4 Q.9) What other element may be added to silicon to make electrons available for conduction of an electric current? Ans.)Phosphorus. Q.10)Define coordination number of a metal ion in an ionic crystal? Ans) In an ionic crystal , coordination number of a metal ion(+ve ion) is the number of negative ions surrounding the metal ion, i.e. which are present as its nearest neighbors.
Posted on: Thu, 13 Mar 2014 04:45:21 +0000
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