Which solution is in contact with both the pure and impure copper sheets during electrorefining of copper?1 markSulphuric acidcopper sulphatecopper chlorideHCl

The solution that is in contact with both the pure and impure copper sheets during electrorefining of copper is copper sulphate.

Here's the step by step process:

1. In the electrorefining process, a block of impure copper is made the anode (positive electrode) and a thin sheet of pure copper is made the cathode (negative electrode).

2. Both the anode and cathode are immersed in an electrolytic solution made of copper sulphate.

3. When electricity is passed through the system, copper ions from the impure copper anode are dissolved into the copper sulphate solution.

4. These copper ions are then attracted to the pure copper cathode, where they deposit and form a pure layer of copper.

5. Impurities from the anode either drop to the bottom of the solution as sludge or stay in the copper sulphate solution.

So, the copper sulphate solution is in contact with both the pure and impure copper sheets during the electrorefining process.