MEDIUMMCQ SINGLEJEE Advanced ChemistryPhysical ChemistryRedox Reactions/Volumetric AnalysisConcept of Oxidation and Reduction

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is

A.+3✓ Correct

B.+2

C.+6

D.+4

Explanation

The balanced chemical reaction of potassium iodide on reaction with acidified potassium dichromate solution is 2 2 7 2 4 2 4 2 4 3 2 2 K Cr O 7H SO 6KI 4K SO Cr (SO ) 7H O 3I → The oxidation state of chromium in 2 4 3 Cr (SO ) is Let the oxidation of chromium is x 2x 3( 2) 0 2x 6 0 6 x 3 2 Therefore, the oxidation of chromium in the final product formed by potassium iodide and acidified potassium dichromate solution is +3

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