Answer:
The reaction that occurs between calcium oxalate and platinum is called Complex formation.
Explanation:
First of all, one might have this belief that there is no possible way a reaction would occur between platinum metal and calcium oxalate, it is taking into consideration because of the relative positions of the two metals in the electro-chemical series.
But in a solution, calcium oxalate seperate into oxalate and calcium ions. when the platinum is put oradded to this solution, a complex is formed between the oxalate ions and platinum ions. then what occurs next is a reaction.
