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EnglandChemistryQuick questions

Topic 3: Redox I

Quick questions on Redox I (Topic 3) - Edexcel A-Level Chemistry

3short 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 oxidation numbers?
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To find an unknown oxidation number, set up an equation: the known values plus the unknown must equal the overall charge. For example, in SO42−\text{SO}_4^{2-}, oxygen is −2-2, so x+4(−2)=−2x + 4(-2) = -2, giving sulfur =+6= +6.
What is q1?
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Determine the oxidation number of chromium in the dichromate ion Cr2O72−Cr_2O_7^{2-}. [2 marks]
What is q2?
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Explain why the reaction of chlorine with cold dilute sodium hydroxide is a disproportionation. [2 marks]

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