JEE Main levelOne or more correct optionsDifficulty 2 of 3mt086
Complete heating of which of the following gives COX2 as one of the products?
ACaCOX3⋅MgCOX3
BFeX2OX3⋅xHX2O (limonite)
CZnCOX3
DFeCOX3
Answer: A, C, D
Metal carbonates decompose to the oxide and COX2, which covers ZnCOX3, FeCOX3 and dolomite. Hydrated iron(III) oxide loses only water and contains no carbonate.