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Q.

If the unit cell of a mineral has cubic close packed (CCP) array of oxygen atoms with m  fraction of octahedral holes occupied by Aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are

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a

12,18

b

1,14

c

12,12

d

14,18

answer is A.

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Detailed Solution

For ccp lattice; No. of atoms (z) = 4No. of octahedral holes 4,No. of tetrahedral holes 8Al+3  is present in 12 of the octahedral holes whereas Mg+2 are present in 18 of the tetrahedral holes to obtained balanced composition
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