The correct answer is option D.
FeS is more soluble in acidic solution than in pure neutral water.
In chemistry, FeS is commonly known as ferrous sulfide or black iron sulfide.
In this compound, Fe is iron and S represents sulfur.
Ferrous sulfide will be more soluble in an acidic solution because it contains an anion that is derived from the weak acid.
As we know that the solubility of a weak acid is more in an acidic solution than in pure water.
in general, these anions have the ability to combine with protons present in the acidic solution and hence increase the solubility of the compound.
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