Co-ordination number Mg2+ , Al3+ in mineral spinel (MgAl​2O4) are respectively
a) 3 and 4
b) 4 and 3
c) 4 and 6
d) 6 and 4
answer is 3 please explain how to solve this 

Dear Student,

The mineral spinel MgAl2O4 contains oxide ions which are arranged in ccp geometry pattern, where Al3+ occupies octohedral voids while Mg2+ occupies tetrahedral voids hence the answer is 3 for the given questionnaire.

Regards.

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