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Question

Match the List-I with List-II and List-III:
List-I
(Solids)
List-II
(Unit cell)
List-III
(Coordination number)
(a) Rock salt (p) Face-centred cubic, anion in tetrahedral void (w) 6
(b) Fluorite (q) Face-centred cubic, cation in octahedral void (x) Cation (8), anion (4)
(c) Agl, ZnS (r) Face-centred cubic, cation in alternate tetrahedral void (y) Cation (4), anion (8)
(d) Na2O(s) Face-centred cubic, cation in tetrahedral void (z) Cation (4), anion (4)

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Solution

(a) Rock Salt (NaCl) Cation: All octahedral voids Coordination
Anion:FCC lattice 6:6
(b) Fluorite Cation:FCC lattice, anion-tetrahedral void Coordination
Cation:8
Anion:4
(c) ZnS,AgI Cation: alternate tetrahedral void Coordination
(Zinc Blende) anion:FCC lattice 4:4
(d) Na2O Cation:tetrahedral voids Coordination
(Antifluorite) anion:FCC lattice Cation:4
Anion:8

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