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सुक्या हवेंत ऑक्सिजनाची अदमासाक टक्केवारी कितली आसता?

A12 टक्के
B15 टक्के
C18 टक्के
D21 टक्के
Answer & Solution
Correct answer: D. 21 टक्के
धर्तरेच्या सुक्या वातावरणीय हवेच्या खंडांत सुमार 20.95 टक्के ऑक्सिजन आसता.
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