Iron pyrite, $\text{FeS}_2$, is called Fool’s Gold since it is a shiny yellow solid that looks similar to gold. Iron pyrite is an ionic compound. Gold is a metallic element.
(a)[1]
In iron pyrite, $\text{FeS}_2$, both positive and negative ions are present. The positive ion is $\text{Fe}^{2+}$. Deduce the formula of the negative ion.
(b)[2]
A student has a sample of iron pyrite and a sample of gold. Suggest how the student could tell the two substances apart.
(c(i))[2]
Construct a chemical equation for the reaction of iron pyrite with oxygen.
(c(ii))[1]
Give one use for sulfur dioxide.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Either S^{2}⁻ or S⁻” …