Take copper sulphate solution in a test tube and place a silver few granule in it. After some time you observe that there is no change in the test tube, i.e., blue colour of copper sulphate does not fade away. This shows silver is less reactive than copper.
Ag(s) + CuSO4(ag) → No reaction
Explain the terms:
(a) Anodising
(b) Aqua regia.