JEE Main 2020ChemistryRedox ReactionsEasyNumerical

JEE Main 2020 — Redox Reactions Question with Solution

JEE Main 2020 (02 Sep Shift 2)

Question

The oxidation states of transition metal atoms in K2Cr2O7, KMnO4 and K2FeO4, respectively, are x,y and z . The sum of x, y and z is______

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Show full solutionCorrect answer: 19
Correct answer
19

Step-by-step explanation

Compound  Oxidation state of transition element.

Oxidation states of K =+1 and O=-2

(i) K2Cr2O7     x=+6
(ii) KMnO4          y=+7
(iii) K2FeO4        z=+6
so (x+y+z)=19

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About this question

This is a previous-year question from JEE Main 2020, covering the Redox Reactions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.