Which of the following is a decreasing order of oxidation states of the central atoms?

Options

A. `PCl_(5), HIO_(4), Cl_(2)O_(7)^(2-), Cl_(2)O`
B. `Cr_(2)O_(7)^(2-), Cl_(2)O, HIO_(4), PCl_(5)`
C. `HIO_(4), Cr_(2)O_(7)^(2-), PCl_(5), Cl_(2)O`
D. `Cr_(2)O_(7)^(2-), HIO_(4), Cl_(2)O, PCl_(5)`

Answer

C

Explanation

`Cl_(2)O rarr 2x+1(-2)=0 rArr x=+1`
`Cr_(2)O_(7)^(2-) rarr 2x+7(-2)=-2rArr x = +6`
`HIO_(4) rarr +1+x+4(-2)=0 rArr x = +7`
`PCl_(5) rarr x + (-5) = 0 rArr x = +5`