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Saroj arora

Gold (Ag) and copper (Cu) obtained after extraction are in impure form. So, metals like gold and copper are refined by electrolytic refining. Other than gold and copper, electrolytic refining is used for metals such as Zn and Ag. Sodium ...

Chander

Class 12 Biology Chapter-9 Strategies for Enhancement in Food Production MCQ Class 12 Science Biology Important MCQ Questions 12th Science Biology Extra MCQ Questions Answers Class 12th Science Session 2022-2023 12th Biology NCERT Syllabus MCQ Questions