Question

If a solid is placed in a liquid and lots of bubbles are formed, what type of reaction has occurred?
A.physical only
B.chemical only
C.physical and chemical

Answer 1

B___________________________________________

Answer 2

Your answer is going to be B. 

Any time you see bubbles in a reaction (other than from boiling) it's automatically a chemical reaction.

I hope I was able to help. Best of luck.