What is the name of the theroy that sientists developed to explain the formation of the universe
plate tectonic ,big bang, continental drift or black hole

The name of the theory that scientists developed to explain the formation of the universe is the Big Bang.

The more soluble in basic solution than in pure water is  co2. The only thing you should remember in order to solve tasks like this is that colorless gas carbon dioxide is always dissolved in basic media. All the other options are more soluble in pure water than in basic solutions.