Q.

Incorrect statement is

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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
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