निम्नलिखित में से किसे पृथ – McqOptions

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1.	निम्नलिखित में से किसे पृथ्वी के वायुमंडल में परिवर्तनशील गैस माना जाता है?
A.	भाप
B.	नाइट्रोजन
C.	ऑक्सीजन
D.	आर्गन
Answer» B. नाइट्रोजन

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