(C)
(b)28. शुद्ध वायु कहलाती है-
२ (a) 20.94%N., 78.98%0, तथा 0.03%CO,
(b) (b) 78.98%N, 20.94%0, तथा 0.03%CO,
(c) 60.30%N, 39.20%0, तथा 0.03%CO,
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