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Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
Give reactions to show that $SO _2$ gas acts as a reducing agent.
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Answer

Sulphur dioxide $(SO_2)$ acts as a reducing agent in the presence of moisture.
  • Sulphur dioxide, $SO_2$ reduces halogens $(X^\circ )$ to haloacids $(X^{1-}).$
    $I_2 + 2H_2O + SO_{2 }\rightarrow 2HI + H_2SO_4$
  • $SO_2$_ gas when passed through an acidified solution of $KMnO_4$ it is decolourised due to reduction $(Mn^{7+} to Mn^{2+}).$
    $2KMnO_4 + 2H_2O + 5SO_2 \rightarrow K_2SO_4 + 2MnSO_4 + 2H_2SO_4$
  • Sulphur dioxide $(SO_2)$ reduces $Fe^{3+} $ to $Fe^{2+}$
    $2FeCl_3 + SO_2 + 2H_2O \rightarrow 2FeCl_2 + H_2SO_4 + 2HCl$

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