railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Basic Concepts of Chemistry

दिए गए प्रतीक _____ तत्व का प्रतिनिधित्व करते हैं।

1
स्वर्ण 
2
हाइड्रोजन
3
पारा
4
कार्बन
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