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ChemistryJEE Main 5 Apr 2026, Shift 2·Q20·MCQ·Easy

Practical / Qualitative Analysis · Sulphur dioxide dichromate test

A paper dipped in a dil. HX2SOX4\ce{H2SO4} solution of ‘X' upon treatment with SOX2\ce{SO2} gas turns into green. The compound ‘X' is :
  1. (1)KI-starch
  2. (2)KMnOX4\ce{KMnO4}
  3. (3)Pb(CHX3COO)X2\ce{Pb(CH3COO)2}
  4. (4)KX2CrX2OX7\ce{K2Cr2O7}

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