Which of the following methods is used to obtain pure copper from impure copper?
A. Smelting
B. Roasting
C. Electrolytic refining
D. Calcination
Answer: Option C
Solution (By JKSSB Mock Tests)
In electrolytic refining, impure copper is the anode, pure copper is the cathode, and CuSO₄ acidified with H₂SO₄ is the electrolyte. Copper dissolves from anode and pure copper deposits on cathode. Smelting is reduction with coke.
Explanation:
Ant sting contains formic acid (methanoic acid, HCOOH). It causes a burning sensation. It can be neutralized by applying a mild base like baking soda. Acetic acid is in vinegar, citric acid in lemons, lactic acid in curd.
No comments yet. Be the first to start the discussion!