Q. वायुमण्डल में ऑक्सीजन की मात्रा कितनी होती है

(A) 18%
(B) 21%
(C) 78%
(D) 39%

✅ Correct Answer: (B) 21%

Published by Radhika Singh ⭐ 4.69K Points at 04-Oct-2021 11:48 am in Science

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