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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions3 Marks
Question
  1. In the following redox reactions, identify the oxidation and reducing agents:
  1. $\text{H}_3\text{PO}\text{(aq)}+2\text{HgCl}_2+2\text{H}_2\text{O}\text{(aq)}\\ \xrightarrow{ \ \ \ \ }\text{H}_3\text{PO}_4\text{(aq)}+2\text{Hg(l)}+4\text{HCl(aq)}$
  2. $\text{O}_2\text{(g)}+\text{PtF}_6\text{g}\xrightarrow{ \ \ \ \ }\text{O}_2^+[\text{PtF}_6]^\ominus\text{(s)}$
  1. Why does $H_2S$ acts as reducing agent only whereas $SO_2$​​​​​​​ acts as bot oxidant as wells as rductant?
✓

Answer

a.
i. $\mathrm{H}_3 \mathrm{PO}_2$, is reducing agent, $\mathrm{HgCl}_2$ is oxidising agent.
ii. $\mathrm{O}_2$ is reducing agent where as $\mathrm{PtF}_6$ acts as oxidising agent.
b. $\mathrm{H}_2 \mathrm{~S}$ has ' S ' in -2 (lowest) oxidation state, it can only lose electrons acts as reductant. $\mathrm{SO}_2$ has ' S ' in +4 oxidation state can show +6 as well as lower oxidation state, therefore, acts as both oxidant as well as reductant.

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