Solution Of `CuSO_4` is blue. On placing a zinc strip Solution becomes colourless . But if a strip of silver or gold is placed in it, the solution remains coloured Explain Why ?

Answer

B

Explanation

Since `(H^+)` given by `NH_4Cl` will be less than 0.01 M so cell emf will be more . `E_("cell")` increases as concentration of cathodic compartment increases.