The unstable compounds are

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${CrO}_{3}$

${MnI}_{7}$

${Mn}_{2} O_{7}$

${Cr}_{2} O_{3}$

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Detailed Solution

In MnI₇, Mn is present in +7 oxidation state which is possible but due to large size of iodine atoms, seven iodine atoms cannot accommodate around Mn. Therefore, MnI₇ is not stable. Rest of compounds are stable and found in nature.

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