state gov UKPSC RO ARO Mock Tests Series 2025 General Science Chemistry Classification of Elements and Periodicity in Properties

प्रोटीन का मुख्य तत्त्व क्या है?

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हाइड्रोजन
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नाइट्रोजन 
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ऑक्सीजन 
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कार्बन 
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