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प्रश्न
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
(i) Au
(ii) Cu
(iii) Na
(iv) K
विकल्प
(i) and (ii)
(i) and (iii)
(ii) and (iii)
(iii) and (iv)
MCQ
उत्तर
(i) and (ii)
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