[shubhamgh]

Hello I am confused about the solution as how to solve the for the answer.

I found this but couldn't solve to get anything.

Ag/AgCl electrode is insoluble salt type electrode, here redox reaction of Ag takes place as

AgCl(s) + e– → Ag(s) + Cl–(aq). (1)

Also Ag falls below H in electrochemical series (+0.8 V vs SHE) and hence can behave as non- polarizable electrode i.e. its potential doesn't change by passing current through it so this type of electrodes can be used as reference electrodes

[Borek]

Do you know the Nernst equation?

What is concentration of Ag⁺ after addition of dichromate?