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

निसर्गात आढळणारा सर्वात कठीण धातू कोणता आहे?

1
लोह 
2
प्लॅटिनम
3
सोने
4
टंगस्टन
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