**Passage 13:** A solution contains moles of and moles of . This solution is titrated with in acidic — Redox Reactions and Volumetric Analysis Chemistry Question
Question
**Passage 13:** A solution contains $0.1$ moles of $Fe^{2+}$ and $0.1$ moles of $Fe^{3+}$. This solution is titrated with $KMnO_4$ in acidic medium. The resulting solution is then treated with excess $Zn/HCl$ and titrated again with $KMnO_4$. <br> **Q1:** The moles of $KMnO_4$ required in the first titration is:
Answer: A
💡 Solution & Explanation
**Step 1:** Only $Fe^{2+}$ is oxidized by $KMnO_4$. <br>**Step 2:** $n$-factor $Fe^{2+} = 1$, $KMnO_4 = 5$. <br>**Step 3:** $5 \times n = 1 \times 0.1 \Rightarrow n = 0.02$ moles.
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