"Middle row anomaly" is related with:

stability of transition metal oxides

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stability of alkali metal oxides

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Instability of halogen oxides

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stability of alkaline earth metal oxides

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Solution

The correct options are
A stability of transition metal oxides
B Instability of halogen oxides
The bromine oxides, $B r_{2} O, B r O_{2}, B r O_{3}$ are the least stable halogen oxides (Middle row anomaly) and exist only at low temperatures due to transition metal contraction.

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