How does the sun speed up the process of the creation of acid rain?

I’m doing a project for school and I’ve already found out the acid rain occurs when sulfur oxide and nitrous oxide mix into the atmosphere and water. I also know that the sun speeds it all up. But I need to know how it does that. Can anyone tell me?

What is the process that converts light energy from the sun to chemical energy stored in glucose called?

Why cant the Sun be powered by a chemical process such as the combustion of hydrogen and oxygen to form wa?

Why can the Sun not be powered by a chemical process such as the combustion of hydrogen and oxygen to form water?