Question

Znco3 is heated in the absence of oxygen .what happens when:

Answer 1

ZnCo3------ ZnO + Co2
When Zonc carbonate is heated in absence of oxygen it will give Zinc oxide and carbon dioxide.

Answer 2

when Znco3 is heated in the absence of air .
than it is a decomposition reaction .and it gives Zno (s) and CO2 ( g).