The process you have described involves the conversion of elemental zinc $Zn$ into zinc sulfate $ZnSO4$, and then further conversion into another compound represented as "X," before finally forming zinc oxide $ZnO$.

To determine the identity of the compound "X," we would need additional information about the specific reaction conditions and reactants involved in the conversion from zinc sulfate to the unidentified compound.

If you have any further details or context related to the reaction, please provide them so that we can help you identify the intermediate compound "X."