Metal M ions form accp structure. Oxide ions occupy ½ octahedral and ½ tetrahedral voids. What is the formula of the oxide?
(a)MO
(b)M`"O"_{2}`
(c)M`"O"_{3}`
(d) `"M"_{2}``"O"_{3}`
(d) `"M"_{2}``"O"_{3}`
Explanation :
The formula of the oxide is option (d) M2O3.
Metal M ions form ccp structure. Let number of ions of M be : X
No. of tetrahedral voids = 2x
No. of octahedral voids = x
Number of oxide ions will be `1/2` x + 1/2 (2x) = `3/2` x
Formula of oxide = Mx`"O"_{3}`/2 x = M2`"O"_{3}`
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