Which reaction will mostly likely take place. Pt+FeCl3, Mn+CaO, Li+ZnCO3, Cu+2KNO

The correct answer is Li + ZnCO₃.

As lithium is very active, so the reaction that takes place most likely is Li + ZnCO₃. As lithium is more reactive than zinc, thus, it possesses the tendency to displace it, such kind of reaction is known as displacement reaction. Displacement reaction refers to a chemical reaction in which the displacement of less reactive elements takes place by a more reactive element. Both the non-metals and metals undergo displacement reactions.