Which one of the following oxides is ionic (1) \( \mathrm{MnO} \) (...

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Which one of the following oxides is ionic
(1) \( \mathrm{MnO} \)
(2) \( \mathrm{Mn}_{2} \mathrm{O}_{7} \)
\( \mathrm{P} \)
(3) \( \mathrm{CrO}_{3} \)
(4) \( \mathrm{P}_{2} \mathrm{O}_{3} \)
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