In normal spinel structure there is a closed packed array of \( \mathrm{O}^{2-} \) ions. The tri...

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In normal spinel structure there is a closed packed array of \( \mathrm{O}^{2-} \) ions. The trivalent cations are present in
(1) \( 75 \% \) of octahedral voids
(2) \( 50 \% \) of octahedral voids
(3) \( 12.5 \% \) of tetrahedral voids
(4) \( 25 \% \) of octahedral voids
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