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Which of the following does not react wi...

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

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Platinum is a noble metal. The sum of its first four ionization enthalpies is very large. Therefore, it does not react with oxygen directly. In contrast Zn, Ti and Fe are active metals and hence directly ract with oxygen to form their respective oxides.
`(2 Zn +O_(2) overset(Delta)rarr 2 ZnO, Ti + O_(2)overset(Delta)rarr TiO_(2), 2 Fe + 3O_(2)overset(Delta)rarr 2 Fe_(2)O_(3))`
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