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एक स्वस्थ प्रौढ़ व्यक्ति के शरीर में सबसे अधिक पाये जाने वाले तत्व का भार है- ऑक्सीजन (61.4%), कार्बन (22.9%), हाइड्रोजन (10.0%) और नाइट्रोजन (2.6% )। एक 75 कि.ग्राम. वजन वाले व्यक्ति के यदि सारे 1H परमाणु 2H परमाणुओं से प्रतिस्थापित हो जायें तो उसका वजन बढ़ेगा:

(a) 37.5 kg

(b) 7.5 Kg

(c) 10 kg

(d) 15 kg

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