Consider the following redox reaction - HSC - SSCE Chemistry - Question 13 - 2017 - Paper 1
Question 13
Consider the following redox reaction.
2K ext{Cr}_2 ext{O}_7(aq) + 2H_2O(l) + 3S(s) → 2Cr_2O_3(aq) + 4KOH(aq) + 3SO_2(g)
Which species is being oxidised?
A. Cr$^{... show full transcript
Worked Solution & Example Answer:Consider the following redox reaction - HSC - SSCE Chemistry - Question 13 - 2017 - Paper 1
Step 1
Identifying the Oxidation States
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Answer
To determine which species is being oxidised, we need to analyze the oxidation states of the elements in the reaction. The oxidation state of sulfur (S) in solid form is 0. In the products, sulfur is present in SO2, where its oxidation state is +4.
Step 2
Understanding Oxidation
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Answer
Oxidation involves an increase in oxidation state. Here, sulfur goes from an oxidation state of 0 in S to +4 in SO2. Hence, sulfur is the species that is being oxidised.
Step 3
Conclusion
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Answer
Based on the analysis above, the correct answer is D. S.
