Assign an oxidation number to each element in the reaction.
CaF2 (s) + H2SO4 (aq) → CaSO4 (aq) + 2HF (g)
In CaF2, the oxidation number of Ca is
, and that of F is
. In H2SO4, the oxidation number of H is
, that of S is
, and that of O is
. In CaSO4, the oxidation number of Ca is
, that of S is
, and that of O is
. In HF, the oxidation number of H is
, and that of F is
.
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