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Which of the following does not react with oxygen directly ? Zn, Ti, Pt, Fe

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Which of the following does not react with oxygen directly ? Zn, Ti, Pt, Fe

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Platinum is a noble metal. Its ionisation enthalpy is very large. Therefore, it does not react with oxygen directly. In contrast, Zn, Ti and Fe are active metals and hence, directly react with oxygen to form their respective oxides :
Zn + O2 → ZnO2
Ti + O2 → TiO2
4Fe + 3O2 → 2Fe2O3

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