(C) The chemical formulas for the given ores are as follows:$1$. Haematite: $Fe_2O_3$ (Ore of iron)$2$. Magnetite: $Fe_3O_4$ (Ore of iron)$3$. Cassite

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(C) The chemical formulas for the given ores are as follows:$1$. Haematite: $Fe_2O_3$ (Ore of iron)$2$. Magnetite: $Fe_3O_4$ (Ore of iron)$3$. Cassiterite: $SnO_2$ (Ore of tin)$4$. Limonite: $Fe_2O_3 \cdot 3H_2O$ (Ore of iron)Therefore,Cassiterite is the ore that does not represent an ore of iron.