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Which of one of the following burns in the air giving a gaseous oxide? (at room temp.)

1. Hydrogen
2. Sodium
3. sulphur
4. Helium

Correct answer: Sodium

Solution

Sodium is a highly reactive metal and burns in air, producing sodium oxide/peroxide, which are oxides formed from combustion. Hydrogen burns too, but it forms water rather than a gaseous oxide in this context; helium is inert, and sulphur is a nonmetal that forms sulfur dioxide.

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