What is the oxidation state of the Chromium () atom in the catalyst predominantly used for the water — Hydrogen Chemistry Question

💡 Solution & Explanation

The catalyst used in the water-gas shift reaction is iron chromate, whose chemical formula is $FeCrO_4$. Assuming Iron is in its common $+2$ oxidation state in this specific lattice framework, the oxidation state of Chromium is $x$: $2 + x + 4(-2) = 0 \implies x = +6$.