Air is a mixture of various gases. One of the gases is 21% part of
the air and is essential for the survival of human beings. This
gas is
(a) nitrogen (c) ozone
(b) oxygen (d) argon
NCERT Class VIII
Science - Exemplar Problems
Chapter 18. Pollution of Air and Water
Answers
Answered by
6
Option (b) oxygen is the correct answer .
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Answered by
4
option b) oxygen it is essential for the survival of the human beings and is 21% of the gases
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