chemistry. Which is a base?
posted by Sam .
ZnCO3, CL2, NaCL, Zn(NO3)2, Zn.
It isn't quite that simple. All of them might be bases depending upon what they react with. However, in the context of your question, and I assume this is at an elementary level, ZnCO3 is my choice. It will react with acids to give CO2 and H2O from the CO3^-2.
Thank you! That is what I was thinking.