पृथ्वी के क्रस्ट पर आक्सीज – McqOptions

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1.	पृथ्वी के क्रस्ट पर आक्सीजन के बाद सबसे अधिक उपलब्ध कौन-सा मूलतत्त्व है -
A.	सिलिकान
B.	कार्बन
C.	सोडियम
D.	अल्युमीनियम
Answer» B. कार्बन

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