Q.

A crystal is made up of metal ions ‘M1 ’ and ‘M2 ’ and oxide ions. Oxide ions from a ccp lattice structure. The cation ‘M1 ’  occupies 50% of octahedral voids and the ‘M2 ’  occupies 12.5% of  tetrahedral voids of oxide lattice. The oxidation number of ‘ M1’ and ‘M2 ’ are respectively are

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a

+4,+2

b

+3,+1

c

+2,+4

d

+1,+3

answer is A.

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So 2x+y=8: x=2,y=4

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