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  2. Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with SO_2 Write the ionic equations for the reaction.
# NCERT

8.16 Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with 

 (ii)\; SO_{2} 

Write the ionic equations for the reaction.

Answers (1)
M manish

Reaction of acidified permanganate solution with sulphur dioxide (SO_{2}). It oxidises the SO_{2} to sulphuric acid (H_{2}SO_{4})
Here are the reactions-

\\MnO_{4}^{2-}+6H^{+}+5e^{-}\rightarrow Mn^{2+}+3H_{2}O]\times 2\\ SO_{2}+2H_{2}O+O_{2}\rightarrow 4H^{+}+2SO_{4}^{2-}+2e^{-}]\times 5
------------------------------------------------------------------------------------------------
2MnO_{4}^{2-}+10SO_{2}+4H_{2}O+5O_{2}\rightarrow 2Mn^{2+}+10SO_{4}^{2-}+8H^{+}

 

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