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JEE Main 202623 JanuaryEvening Shift
Exam
JEE Main
Year
2026
Date
23 January
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2026 · 23 January · Evening Shift · Chemistry · d and f Block Elements

The oxidation state of chromium in the final product formed in the...

The oxidation state of chromium in the final product formed in the reaction between KI and acidified K2Cr2O7\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} solution is:

Options

  1. A+6+6
  2. B+3+3
  3. C+4
  4. D+2

Correct answer

B. +3+3

Step-by-step solution

In the reaction between KI and acidified K2Cr2O7K_2Cr_2O_7, Cr in the dichromate ion exists in +6 oxidation state. Iodide ions are oxidized to I2I_2 while chromium is reduced. The reduction product is Cr3+Cr^{3+} ions, which form chromium(III) salts like Cr2(SO4)3Cr_2(SO_4)_3 or coordination complexes. Therefore, the oxidation state of chromium in the final product is +3.
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