alleryশুষ্ক বায়ুত অক্সিজেনৰ আনুমানিক শতাংশ কিমান?
A১২ শতাংশ
B১৫ শতাংশ
C১৮ শতাংশ
D২১ শতাংশ
Answer & Solution
Correct answer: D. ২১ শতাংশ
পৃথিৱীৰ শুষ্ক বায়ুমণ্ডলীয় বায়ুৰ আয়তনৰ প্ৰায় ২০.৯৫ শতাংশ হ'ল অক্সিজেন।
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