railway RRB Technician Grade 3 Mock Test 2024 Chemistry General Principles And Process of Isolation of Elements Metals and Its Ores

भूपर्पटी में अधिकतम बहुतायत में पाये जाने वाले तत्व _________ है।

1
Al और Fe
2
Al और Cu
3
Fe और Cu
4
Cu और Ag
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