Question

# The type of holes occupied by $${Al^{3+}}$$ ions is__________.

A
tetrahedral
B
octahedral
C
both A and B
D
none of the above

Solution

## The correct option is B octahedralAs $$O^{2-}$$ ions forms ccp, spinel has $$4$$ negative ions in its structure. So, total positive charge should be $$8$$.It has one $$Mg^{+2}$$ ion occupying one-eight of the tetrahedral holes and $$2$$ $$Al^{+3}$$ ions occupying one-half of the octahedral holes. So, the compound is $${Mg Al_2O_4}$$.Chemistry

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