railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Chemistry Basic Concepts of Chemistry

निम्नलिखित में से कौन-सी धातु भू-पर्पटी में सबसे प्रचुर मात्रा में है?

1
Mg
2
Na
3
Al
4
Fe
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