Question

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

1. Au
2. Cu
3. Na
4. K

विकल्प

• (i) and (ii)

• (i) and (iii)

• (ii) and (iii)

• (iii) and (iv)

Answer 1

(i) and (ii)

Explanation - 

Among the given metals, sodium (Na) and potassium (K) are highly reactive metals and are extracted by the electrolytic reduction of their molten chloride salts. Copper (Cu) and gold (Au) are extracted by electrolytic refining.