Chemistry
Grade-6
Easy
Question
Read the following paragraph and answer the question from the following.
Until the 18th century, people use to believe that air was just a substance. Now by many experiments, it has been proved that it is not a substance, but it is a mixture of gases.
Which of the following statements is/are correct?
(i) Water is present in the vapor form in the air.
(ii) Water is not present in the air.
(iii) Air is a mixture of liquid and gases.
(iv) Some impurities like smoke and germs are also present in the air.
- Only (i) and (ii)
- Only (ii) and (iii)
- Only (iii)
- Only (iv)
Hint:
When two or more substances are mixed together in any proportion it is called a mixture. A pure substance, which is composed of two or more different elements, combined chemically in a definite ratio is called a compound.
The correct answer is: Only (ii) and (iii)
The statement "Water is not present in the air" and "Air is a mixture of liquid and gases" are correct.
In a mixture, constituent substances retain all of their individual properties. Mixtures can be separated by simple physical methods. On the other hand, in compounds, constituent elements lose their individual properties and these element can be separated only by chemical methods.
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