(D) The chemical formulas for the given ores are:$1$. Cryolite: $Na_3AlF_6$ (a fluoride halide ore).$2$. Fluorspar: $CaF_2$ (a fluoride halide ore).$3

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(D) The chemical formulas for the given ores are:$1$. Cryolite: $Na_3AlF_6$ (a fluoride halide ore).$2$. Fluorspar: $CaF_2$ (a fluoride halide ore).$3$. Horn silver: $AgCl$ (a chloride halide ore).$4$. Limonite: $Fe_2O_3 \cdot 3H_2O$ (an oxide ore).Since Limonite is an oxide ore and not a halide ore,the correct option is $D$.