Question

Out of Ni and Ag which is Cathode and Why?

Answer 1

Answer:

the electrode which gets reduced due to gain of electron is called cathode and the electrode which get oxidised you 2 release of electron is called.

you cannot differentiate between elements as cathode and anode

recall the concept of concentration cell in which two electrodes of same material each electrode dipped in its own iron and both solution have different concentration.

another point to be noted is that you have not mentioned which type of cell you are talking about,

is it a galvanic cell, a reversible cell or electrolytic cell.