Question

What happens when a strip of zinc is dipped in a copper sulphate solution?

• A. Blue colour solution changes to red
• B. Blue colour of solution fades up.
• C. Blue colour of solution becomes darker
• D. Blue colour solution changes to orange

Answer 1

The correct option is B

Blue colour of solution fades up.

The following reaction takes when a strip of zinc is dipped in a copper sulphate solution:
Zinc + copper sulphate $\to$ copper + zinc sulphate

Due to which blue colour of copper sulphate solution disappears slowly . The disappearance of the blue colour during the reaction indicates that the copper ions have been dispalced by zinc from it's sulphate solution. These ions form metallic copper coating on the remaining zinc powder.