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Which of the following are pure substances?
1. Gaseous air
2. A mixture of gaseous air and liquid water
3. A mixture of liquid water and water vapour
4. A mixture of gaseous air and oil
  • a)
    1 and 2
  • b)
    2 and 3
  • c)
    3 and 4
  • d)
    1 and 3
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following are pure substances?1. Gaseous air2. A mixture ...
Example of pure substance:
1. Atmospheric air
2. Steam water mixture
3. Combustion products of a fuel
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Most Upvoted Answer
Which of the following are pure substances?1. Gaseous air2. A mixture ...
Pure substances are substances that are composed of only one type of molecule or atom. They have a fixed chemical composition and distinct physical properties. Based on this definition, let's analyze each option to determine which ones are pure substances.

1. Gaseous air:
Gaseous air is a mixture of several gases, including nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. Therefore, gaseous air is not a pure substance because it is a mixture of different substances.

2. A mixture of gaseous air and liquid water:
This option clearly states that it is a mixture of two substances, gaseous air and liquid water. Since it is a mixture, it is not a pure substance.

3. A mixture of liquid water and water vapor:
Similar to the previous option, this choice also describes a mixture of two substances, liquid water and water vapor. Therefore, it is not a pure substance.

4. A mixture of gaseous air and oil:
Once again, this option indicates a mixture of two substances, gaseous air and oil. Since it is a mixture, it is not a pure substance.

From the analysis above, it is evident that options 1 and 3 are not pure substances because they are mixtures. However, options 2 and 4 are mixtures as well, so they are not pure substances either. Therefore, none of the given options are pure substances.

In summary, a pure substance is a material that consists of only one type of molecule or atom. It has a fixed chemical composition and distinct physical properties. Based on this definition, none of the options provided in the question are pure substances.
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Which of the following are pure substances?1. Gaseous air2. A mixture of gaseous air and liquid water3. A mixture of liquid water and water vapour4. A mixture of gaseous air and oila)1 and 2b)2 and 3c)3 and 4d)1 and 3Correct answer is option 'D'. Can you explain this answer?
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