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InterviewSolution
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Which of the following statements is /are correc ? I. For a simple cubic lattice , d= a and for fcc it is `d=a//sqrt2` II. The density of the unit cell for cubic crystals for element is `rho=(ZM)/(a^3N_Axx10^(-3)) gcm^(-3)` III. In case of ionic compound `A^+B^-` having fcc structures as NaCl edge (a) = 2 x distance between `A^+ " and " B^-` ions .A. I and IIB. II and IIIC. I and IIID. All of these |
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Answer» Correct Answer - D For a simple cubic lattice , d=a and for fcc , `d=a//sqrt2`. For a cubic crystal of elements , the density of the unit cell is `rho=(ZM)/(a^3N_Axx10^(-30))gcm^(-3)` In case of ionic compounds `A^+ B^-` having fcc structures as NaCl , edge (a) = 2 x distance between `A^+ " and " B^-` ions . Hence , all the statements are correct . |
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