Select the correct order of acidic nature of metal oxide: (a) \( \mathrm{MnO}\mathrm{Mn}_{3} \ma...

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Select the correct order of acidic nature of metal oxide:
(a) \( \mathrm{MnO}\mathrm{Mn}_{3} \mathrm{O}_{4}\mathrm{Mn}_{2} \mathrm{O}_{3}\mathrm{Mn}_{2} \mathrm{O}_{7} \)
(b) \( \mathrm{CrO}\mathrm{Cr}_{2} \mathrm{O}_{3}\mathrm{CrO}_{3}\mathrm{CrO}_{2} \)
(c) \( \mathrm{MnO}\mathrm{Mn}_{2} \mathrm{O}_{3}\mathrm{Mn}_{3} \mathrm{O}_{4}\mathrm{Mn}_{2} \mathrm{O}_{7} \)
(d) \( \mathrm{CrO}\mathrm{Cr}_{2} \mathrm{O}_{3}\mathrm{CrO}_{2}\mathrm{CrO}_{3} \)
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