state gov UP Police Workshop Staff (Radio Cadre) Mock Test General Science Chemistry Periodic Table

खालीलपैकी कोणता धातू चाकूने कापला जाऊ शकतो?

1
अल्युमिनियम 
2
प्लॅटिनम 
3
तांबे 
4
सोडियम 
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