It is a mixture of gases that makes up the earth’s atmosphere. Air is composed of about 78% nitrogen , 21% oxygen
,0.9% argon
,0.1% other gases. Trace amount of carbon dioxide
, methane
, water vapours and neon are some of the other gases that make up the remaining 0.1%. The proportions of water vapour and dust decrease with altitude. Air contains no water vapour beyond 12 km above sea level. The amount of dust also decreases with altitude.
The properties of air are:
The percentage amount of which of these gases in air is the least ? | |||
Right Option : B | |||
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All the elements of life support system are ___________________ | |||
Right Option : D | |||
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Which of the following statements about is correct? | |||
Right Option : D | |||
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