A mineral consists of a cubic close packed structure formed by
O2- ions where half the octahedral voids are occupied by Al 3+ and one eight of the tetrahedeal voids are occupied by Mn2+ . The chemical formula of the mineral is.
a. Mn3 Al 2 O 6
b. Mn Al 2 O 4
c. MnAl 4 O 7
d. Mn2 Al 2 O 5
Ans. b
(8)
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