1.

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

Answer»

Solution :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 + O_2 to ZnO_2 `
`Ti + O_2 to TiO_2`
`4Fe + 3O_2 to 2Fe_2O_3`


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