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Physical Chemistry

Quick questions on Redox reactions and oxidation numbers: Singapore A-Level H2 Chemistry

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are assigning oxidation numbers?
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Oxidation number is the charge an atom would have if all bonds were fully ionic. Apply these rules in order:
What are building balanced redox equations?
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Combine two half-equations so the electrons cancel:
What is q1?
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Determine the oxidation number of sulfur in (a) SO42−\text{SO}_4^{2-} and (b) S2O32−\text{S}_2\text{O}_3^{2-}. [2 marks]
What is q2?
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State whether each is oxidised or reduced: (a) Fe2+→Fe3+\text{Fe}^{2+} \rightarrow \text{Fe}^{3+}, (b) Cl2→2Cl−\text{Cl}_2 \rightarrow 2\text{Cl}^-. [2 marks]
What is q3?
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Combine I2+2e−→2I−\text{I}_2 + 2e^- \rightarrow 2\text{I}^- and S2O32−→S4O62−+2e−\text{S}_2\text{O}_3^{2-} \rightarrow \text{S}_4\text{O}_6^{2-} + 2e^- into a balanced equation. [2 marks]

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