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Q.174 :  ऑक्सिजन की खोज 1774 मे किसने करी ?

(a) समूल बेककेटे
(b) लॉरेन्स
(c) जोसेफ प्रीस्टले
(d) मार्कल प्राउस्ट
View Answer
Answer : जोसेफ प्रीस्टले

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