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ChemistryJEE Main 2 Apr 2026, Shift 1·Q11·MCQ·Easy–moderate

d- and f-Block · Oxidising action of dichromate

Which of the following sets includes all the species that will change the orange colour of KX2CrX2OX7\ce{K2Cr2O7} in acidic medium ?
  1. (1)FeX2+\ce{Fe^2+}, SnX2+\ce{Sn^2+}, IX−\ce{I-}, SX2−\ce{S^2-}
  2. (2)SX2−\ce{S^2-}, FeX3+\ce{Fe^3+}, IX−\ce{I-}, CX2OX4X2−\ce{C2O4^2-}
  3. (3)FeX2+\ce{Fe^2+}, NOX2X−\ce{NO2-}, SOX2\ce{SO2}, SnX4+\ce{Sn^4+}
  4. (4)FeX3+\ce{Fe^3+}, SOX4X2−\ce{SO4^2-}, SX2−\ce{S^2-}, SnX4+\ce{Sn^4+}

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