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Chemistry · Redox Reactions

JEE Main 2026 — 2 April, Morning Shift — Question 49

Which of the following sets includes all the species that will change the orange colour of K2Cr2O7\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} in acidic medium?

  1. Option A:

    Fe2+,Sn2+,I−,S2−\mathrm{Fe}^{2+}, \mathrm{Sn}^{2+}, \mathrm{I}^{-}, \mathrm{S}^{2-}

    Correct
  2. Option B:

    S2−,Fe3+,I−,C2O42−\mathrm{S}^{2-}, \mathrm{Fe}^{3+}, \mathrm{I}^{-}, \mathrm{C}_{2} \mathrm{O}_{4}^{2-}

  3. Option C:

    Fe2+,NO2−,SO2,Sn4+\mathrm{Fe}^{2+}, \mathrm{NO}_{2}^{-}, \mathrm{SO}_{2}, \mathrm{Sn}^{4+}

  4. Option D:

    Fe3+,SO42−,S2−,Sn4+\mathrm{Fe}^{3+}, \mathrm{SO}_{4}^{2-}, \mathrm{S}^{2-}, \mathrm{Sn}^{4+}

Answer: A

Step-by-step solution

Reducing agent +KmnO4→ acidic  medium Mn+2++\mathrm{KmnO}_{4} \xrightarrow{\substack{\text { acidic } \text { medium }}} \mathrm{Mn}^{+2}+ Product

Given Reducing Agent Fe+2→Fe+3\mathrm{Fe}^{+2} \rightarrow \mathrm{Fe}^{+3} Sn+2→Sn+4\mathrm{Sn}^{+2} \rightarrow \mathrm{Sn}^{+4} I−→I2\mathrm{I}^{-} \rightarrow \mathrm{I}_{2} S−2→ S\mathrm{S}^{-2} \rightarrow \mathrm{~S}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
2 April, Morning Shift
Subject
Chemistry
Chapter
Redox Reactions
Topic
Types of Redox Reactions & Balancing of Redox Reactions

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