Air is
a) compound
b) element
c) mixture
d) non of these
Answers
Air is a mixture.
Answer: Option (c)
Explanation:
An element is a substance that comprises only similar kinds of atoms. It is represented by a symbol. It has a specific boiling or melting point.
A compound is a substance with two or more elements present together in fixed ratios. It is represented by a formula. The properties of a compound do not vary from place to place. The components can be separated only through chemical.
A ‘mixture’ is a substance made of two or more elements or compounds present in no fixed ratio. Its composition keeps varying with place, altitude and other physical conditions. It cannot be represented by any symbol or formula and its components can be easily separated by physical means.
Air is a ‘mixture’ as it comprises gases like oxygen, nitrogen, carbon dioxide, rare gases in varying proportions that keep changing with respect to physical parameters. Its components can be easily separated. It has no symbol or formula or specific physical properties.
Air is a mixture.
Explanation:
Earth's atmosphere is filled with air. Air is a mixture of many gases and other particles. All living organisms need air to survive. Air has weight and exerts pressure, which is called atmospheric pressure. It has no shape and takes the shape of the container. It is also colourless and odourless. Beyond the atmosphere, there is no air. Space is a vacuum.
Air is comprised of nearly 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and negligible amount of other gases. Air also contains about 1% water vapour.
Animals breathe in oxygen from the air; while plants need carbon dioxide for photosynthesis. Without air, there will be no life on Earth.