MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic Chemistryd and f Block elementsPotassium Dichromate

reacts with H+ as The change in oxidation number of Cr is

A.+5 (b) +7

C.+6 (d) zero

Explanation

2 2 4 2 7 2 2CrO + 2H Cr O + H O -> The oxidation state of Cr in 2 4 CrO can be calculated as: 4 2 2 8 2 6 x x x x >> >> The oxidation state of Cr in 2 2 7 Cr O can be calculated as: 2 7 2 2 2 14 2 2 12 6 x x x x x >> >> >> As we can see that the oxidation state of Cr has not changed in the reaction, so, the correct option will be (d).

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