AS & A Level Chemistry 2.3 Formulae : Exam Style Questions Paper 1

 Question

The reaction between acidified dichromate(VI) ions, Cr₂O₇^2–, and aqueous Fe²⁺ ions results in the dichromate(VI) ions being reduced to Cr³⁺ ions.

What is the correct equation for this reaction?

A \(Cr_{2}O_{7}^{2-} + Fe^{2+} + 14H^{+} \rightarrow 2Cr^{3+} + Fe^{3+} + 7H_{2}O\)

B \(Cr_{2}O_{7}^{2-} + 2Fe^{2+} + 14H^{+} \rightarrow 2Cr^{3+} + 2Fe^{3+} + 7H_{2}O\)

C \(Cr_{2}O_{7}^{2-} + 3Fe^{2+} + 14H^{+} \rightarrow 2Cr^{3+} + 3Fe^{3+} + 7H_{2}O\)

D \(Cr_{2}O_{7}^{2-} + 6Fe^{2+} + 14H^{+} \rightarrow 2Cr^{3+} + 6Fe^{3+} + 7H_{2}O\)