Question

Oxidation number of Cr atom in $Cr{O}_5$ and $K_{3}Cr{O}_8$ respectively:

• A. +6 , +6
• B. +5 , + 6
• C. +6 , + 5
• D. + 5 , + 5

Answer 1

Answer: (B)

+5 , + 6

Structure of $K_{3}Cr{O}_8$

Refer to fig 1

Structure of $Cr{O}_5$

Refer fig 2.

This oxidation state of $Cr{O}_5$ and $K_{3}Cr{O}_8$ is $+6$ and $+5$ respectively.