"What do you think is the proper formulation for H2PtCl6? Why do you think the compound is commonly called chloroplatinic acid?"
I was doing some practice problems and I have just read the problem above. Well, if you are careful enough, this is a very easy question and the "common" name gives it away. As a result, this complex is not a metal hydride. It has to be an acid and therefore it can be written as H2[PtCl6].
Here is a video on how to make this metal complex from my favorite chemistry guy&channel:
I wonder how much money he spent to do these videos! By the way, he hasn't uploaded anything since last year. I hope he is fine and away from trouble.