alleryخشک ہوا میں آکسیجن کا تخمینہ فیصد کتنا ہے؟
A12 فیصد
B15 فیصد
C18 فیصد
D21 فیصد
Answer & Solution
Correct answer: D. 21 فیصد
آکسیجن زمین کی خشک ہوا کے حجم کا تقریباً 20.95 فیصد ہے۔
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