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a
FeO42- ( ferrate) is stable
b
FeO42- is formed in alkaline medium
c
FeO42- decomposes to give Fe2O3 and O2
d
VO2+ and VO+ are stable
answer is A.
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Detailed Solution
No higher oxides of Fe above Fe2O3, areknown, although ferrates (VI)(FeO4)2–, are formed in alkaline media butthey are unstable readily decompose to Fe2O3 and O2