railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Classification of Elements and Periodicity in Properties

নিম্নলিখিত ধাতুগুলির মধ্যে কোনটি সবচেয়ে বেশি বিক্রিয়াশীল?

1
Mg
2
Al
3
Fe
4
Cu
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