CUET · CHEMISTRY · PYQ PAPER 2025
How many moles of dichromate ion will be required to oxidize one mole of \(Fe^{2+}\) to \(Fe^{3+}\) ions in acidic solution?
- A 3
- B 6
- C 1/3
- D \(1 / 6\)
Answer & Solution
Correct Answer
(D) \(1 / 6\)
Step-by-step Solution
Detailed explanation
\(Cr_2O_7^{2-} + 14H^{+} + 6e^{-} \rightarrow 2Cr^{3+} + 7H_2O\) \(Fe^{2+} \rightarrow Fe^{3+} + e^{-}\) Moles of \(Cr_2O_7^{2-}\) per mole of \(Fe^{2+}\) = \(1 \, \text{mole} \, Cr_2O_7^{2-} / 6 \, \text{moles} \, Fe^{2+} = 1/6\)
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