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If the unit cell of a mineral has cubic close packed 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

a. 1/2 , 1/ 8

b. 1 , 1/4

c. 1/2 , 1/ 2

d. 1/4 , 1/ 8

Ans. a

(8)

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