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ഭൂവൽക്കത്തിൽ ഏറ്റവും കൂടുതലുള്ള മൂലകം :

Aഹൈഡ്രജൻ

Bഓക്സിജൻ

Cനൈട്രജൻ

Dകാർബൺ

Answer:

B. ഓക്സിജൻ


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