Identify the type of reaction 2ZNCO3-----3ZNO + CO2

Answer 1

This isn't a reaction of any type as far as I can tell.

First of all, you have 2 Zn (not written as ZN) on the left side of the reaction and 3 Zn on the right side. You also have 6 oxygens on the left and 5 oxygens on the right. How did that happen?

Now, perhaps you are trying to indicate a DECOMPOSITION reaction which might look like this...

ZnCO₃ ==>ZnO + CO₂. If this isn't what you meant, then I have no idea what type of reaction it is.