GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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it can be heated to a higher temperature.
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it can be compressed to a smaller volume.
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it is colorless.
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its composition can vary.
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Detailed explanation-1: -Air is a mixture and not a compound because of the following reasons: Air can be separated into its constituents such as oxygen, nitrogen etc. by fractional distillation of liquid air. Air shows the properties of all the gases present in it.
Detailed explanation-2: -Air is said to be a mixture because air at different places contains different amounts of various gases.
Detailed explanation-3: -Air is composed of many gases, most predominantly nitrogen, oxygen, and argon. Therefore, it is a mixture rather than a compound.
Detailed explanation-4: -The properties of mixture vary because it depends on the type of substance present and on the proportion of the substance being mixed. On the other hand, compounds have a fixed composition and have definite properties.
Detailed explanation-5: -It consists of 78% nitrogen, 21% oxygen and 1 % other gases and water vapour. The composition of air does not change as you travel through the layers of the atmosphere. What changes is the number of molecules.