Question: A drain cleaner consists of sodium hydroxide and aluminum. When the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. Which of these best describes what happens to form the bubbles when the cleaner is added to water? F

What is the correct answer to the question from the following choices?
Options are: (1). chemical reaction; (2). Condensation; (3). A physical change; (4). Evaporation;
(1).