Question

Write 'True' or 'False':
1. The process of separating two liquids is called sublimation,
2. A mixture of iodine and sand can be separated by filtration,
3. We can see the particles of homogeneous mixture by naked eyes.
4. The air is a mixture of many gases.​

Answer 1

Answer:

1) false

2) false

3) false

4) true

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Answer 2

Answer:

1. FALSE

The Changing of a solid directly into vapours on heating, and of           vapours into solid on cooling is called sublimation. The solid substance which undergoes sublimation is called sublime. The solid obtained by cooling the vapours of the solid called a sublimate.

     2. FALSE

Iodine is a sublime substance that is, it is converted directly into vapours when it is heated without going into the liquid state. Whereas sand in non-sublime. Therefore when the mixture is heated iodine will sublime and sand will be left behind separating both.

     3. FALSE

The particles of a solution are smaller than 1 nm (10-9 meters) in diameter. So, they cannot be seen by naked eyes. Because of very small particle size, they do not scatter a beam of light passing through the solution.

     4. TRUE

The mixture of gases that form the atmosphere of the Earth. By volume, dry air is composed of nitrogen (78.09%), Oxygen (20.95%), argon (0.93%), carbon dioxide (0.03%), and several trace gases.