JEE Advanced 2015 Chemistry question
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
Answer: (A)
Solution
A ccp unit cell has 4 oxide ions, 4 octahedral holes and 8 tetrahedral holes. Charge balance: = . With in octahedral holes and in tetrahedral holes:
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