Beaker I : Copper ${\text{ Sulphate }}_{\left(\mathrm{aq}\right)}+$  Zinc granules
Beaker II : Iron ${\text{ Sulphate }}_{\left(\mathrm{aq}\right)}+$  Copper metal
Beaker III : Zinc ${\text{ Sulphate }}_{\left(\mathrm{aq}\right)}+$  Iron metal
Beaker IV : Silver ${\text{ Nitrate }}_{\left(\mathrm{aq}\right)}\text{+}$  Copper metal
Radhika observed the above four beakers and reported as follows.
i) The blue colour of copper sulphate changes to colourless and test tube becomes warm in beaker I.
ii) The light green colour of iron sulphate changes blue colour and test tube becomes warm in beaker - II.
iii) No reaction is observed in beaker III
iv) A colourless solution changes to blue colour and test tube becomes warm
The correct observations is/are