A test tube full of sulfur dioxide gad was turned upside down in a beaker of water and universal indicator. after a few minutes the water hae risen up the test tube why does the water rise up the test tube

Sulfur dioxide gas reacts with water to form sulfurous acid. Sulfurous acid readily dissociates in water. As the sulfur dioxide gas dissolves in the reaction, the capillary action of the test tube causes water to replace the gas inside the tube. The dissolution of sulfuric acid gas creates a vacuum inside the tube causing the water to rise inside.