The standard Gibbs free energy of formation of ZnO from Zn is lower than that of CO2 from CO. Therefore, CO cannot reduce ZnO to Zn. Hence, Zn is not extracted from ZnO through reduction using CO
So that you can learn while being safe. Wearing goggles, for eye protection when dealing with chemicals
When you get injured or hurt it affects the nervous system and let’s it react by the severity.
Double replacement i believe