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.  

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