Which of the following metal strips when placed in colourless `AgNO_(3)` solution, turns the solution blue?

A student was asked to carry out a chemical reaction by placing four different metal strips in CuSO_(4) solution for a considerable time, one by one. Which of the following metal strip will turn the blue CuSO_(4) solution to a light green solution in due course of time ?

Which of the following solution will turn blue when placed in copper vessel?

State the reason for the following : An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.

Which of the following will not produce a precipitate with AgNO_(3) solution

Which of the following reacts with ammonical AgNO_(3) solution.

When Cu reacts with AgNO_(3) solution, the reaction takes place is

When a copper wire is dipped in aqueous AgNO_(3) solution, the solution turns blue. The reason for this is

When a strip of copper is placed in the solution of silver nitrate, the solution become blue. Why ?