D-And F-Block Elements Ques 483

Question: Of Cr (VI) as Cr2O72  and CrO42  , which is better oxidising agent-

Options:

A) CrO42 , basic medium

B) Cr2O72 , basic medium

C) Cr2O72 , acidic medium

D) CrO3 basic medium

Show Answer

Answer:

Correct Answer: C

Solution:

CrO42(aq)+4H2O+3e Cr(OH)3+5OH, E=0.13V Cr2O72(aq.)+14H+(aq.)+6e 2Cr3+(aq.)+7H2O, E=1.33V



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