Question

plssss ans fast................​

Answer 1

Roasting is a process in which the metal is heated in the presence of oxygen for metal extraction.

Here

(i)CuS(s)+O2(g) gives =CuO(s)+SO2(g)

(ii)CuO(s) +CuS(s) gives = Cu (s) + SO2(g)

Electrorefining is a process of refining or purifying a metal by passing electricity in the solutionof that particular metal.

For electrorefining...

We will take a beaker with salt solution of that metal say CuSO4.

Then we will put some acid like hydrochloric acid in that beaker

Now we will take pure copper strip made up of cathode and a block of impure copper made up of anode.

We will connect the anode to the positive terminal of the battery and the cathode to the negative terminal of the battery.

finally we will get a full electric circuit with a switch.

Now switch on the circuit you will see that the impure copper which was at the anode starts to mix up with the solution of that metal some of the solid impure metal from that strips deposit at the bottom which is known as anode mud.

Now the pure copper is deposited at the cathode.

Hence copper refined from CuSO4.

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