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

2

Answers

2015-06-12T21:09:22+05:30

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Option (b) oxygen is the correct answer .
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2015-06-12T21:10:49+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Option b) oxygen it is essential for the survival of the human beings and is 21% of the gases
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