Question

Whta happens when zinc carbonate is heated in the absence of air? Write balanced chemical equation

Answer 1

it will be converted into zinc oxide.
znco3 = zno+ co2

Answer 2

When zinc carbonate is heated in the absence of air, it forms zinc oxide and carbon dioxide.
The equation for this reaction is as follows:
ZnCO3 → ZnO + CO2.

This type of reaction is called calcination.

Hope this helps you.