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AP EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following is not given by \(\mathrm{SO}_2\) ?

  1. A It converts acidified iodates to iodine.
  2. B It decolourises acidified \(\mathrm{KMnO}_4\) solution.
  3. C It reacts with acidified potassium dichromate to form green coloured solution.
  4. D It reacts with green coloured ferrous sulphate to form yellowish brown ferric sulphate.
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Answer & Solution

Correct Answer

(D) It reacts with green coloured ferrous sulphate to form yellowish brown ferric sulphate.

Step-by-step Solution

Detailed explanation

(i) \(\mathrm{SO}_2\) (Sulphur dioxide) reacts with potassium iodate to form sulphuric acid, potassium sulphate and iodine gas. \[ 5 \mathrm{SO}_2+2 \mathrm{KIO}_3+4 \mathrm{H}_2 \mathrm{O} \longrightarrow 4 \mathrm{H}_2 \mathrm{SO}_4+\mathrm{K}_2 \mathrm{SO}_4+\mathrm{I}_2 \]…