railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Chemical Reaction

ऑक्सिजनसोबत अभिक्रिया न करणारे मूलद्रव्य कोणते आहे?

1
क्लोरीन
2
आयोडीन
3
हेलियम
4
हायड्रोजन
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