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Question

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


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

The correct option is B octahedral
As $$O^{2-}$$ 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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