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1.
| Statement 1: | At room temperature, iron reacts with oxygen to form iron oxide. |
| Statement 2: | At room temperature, sodium reacts with oxygen to form sodium oxide. |
2.
| Statement 1: | We use some metals such as silver, gold and platinum to make ornaments. Gold and platinum react with oxygen to form their corresponding oxides at high temperature. |
| Statement 2: | Silver does not react with oxygen even at high temperature. |
| Statement 1: | Nitrogen does not combine with elements at normal conditions. |
| Statement 2: | Nitrogen combines with elements in the presence of a catalyst. |
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