कीटाणुओं को मारने के लिए स� – McqOptions

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1.	कीटाणुओं को मारने के लिए स्विमिंंग पूल में डाले जाने वाला गैर - धातु कौन सा है -
A.	ऑक्सीजन
B.	आयोडीन
C.	क्लोरीन
D.	नाइट्रोजन
Answer» D. नाइट्रोजन

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