Chemistry
Grade-7
Easy
Question
Air is a mixture because
- It is colorless
- It contains both elements and compounds
- It does not have a fixed composition
- It can be liquified at high pressure
Hint:
It does not have a fixed composition
The correct answer is: It does not have a fixed composition
Because of the following factors, air is a mixture rather than a compound:
- By fractional distillation of liquid air, air can be split into its constituents such as oxygen and nitrogen.
- The properties of all the gases contained in air can be seen. As an example: Because of the presence of oxygen in the air, air promotes burning.
- Because varying amounts of gases are present in the air at different locations, air has a varied composition.
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