Answer the following question:
Arjun is given an unknown solution X. When X is mixed with silver nitrate solution, a white precipitate is formed. The precipitate dissolves when ammonia solution is added.
a. Write the balanced chemical equation for the reaction that takes place.
b. Identify the type of reaction occurring in this process.
c. What is the colour of the product formed on the iron strip?
d. Explain why the blue colour of the solution fades as the reaction proceeds.