railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry

ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁ ପଦାର୍ଥର ସର୍ବାଧିକ ସାନ୍ଦ୍ରତା ଅଛି?

1
ସୁନା 
2
ପାରଦ
3
ତମ୍ବା 
4
ଲୁହା 
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