If you add copper oxide to HCl solution in a beaker, how does colour of solution change?

Raju found that when a zinc rod is immersed in CuSo_4 solution taken in a beaker, the blue colour of the solution faded. Find the reason for the colour change.

On keeping iron nails in copper sulphate sulphate solution for2 hours, the colour of solution changes

When a copper plate is dipped into a solution of ferrous sulphate , the colour of the solution will change to

When a few drops of universal indicator were added to a dilute solution of HCl, it is observed that the colour of the solution changes from

When a few drops of universal indicator were added to a dilute solution of HCl, it is observed that the colour of the solution changes from

An iron nail was dropped into copper sulphate solution. After some time, the colour of the solution changed from :

A piece of granulated zinc was dropped into copper sulphate solution. After some time, the colour of the solution changed from:

When an iron nail is immersed in copper sulphate solution, the colour of solution changes from blue to green colour, The substance formed is the solution is_________

A piece of granulated zinc was dropped into copper sulphate solution. After some time the colour of the solution changed from: