railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Chemistry in Everyday Life

मानवाने वापरलेला पहिला धातू __________ हा होता.

1
ॲल्युमिनिअम 
2
तांबे
3
चांदी
4
लोह
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