Question

What happens when znco3 is heated in the absence of air

Answer 1

The type of equation that will occur is referred to as a decomposition reaction

The following is the reaction that occurs: 

             

              heat

ZnCO3 ----------->  ZnO  +  CO2

 (s)                          (s)         (g)

This specific reaction usually takes place during the calcination of metal ores such this zinc carbonate to form the zinc oxide.