Which of the following have been arranged in the decreasing order of oxidation number of sulphur ?

Options

A. `Na_(2)S_(4)O_(6) gt H_(2)S_(2)O_(7) gt Na_(2)S_(2)O_(3) gt S_(8)`
B. `H_(2)SO_(4) gt SO_(2) gt H_(2)S gt H_(2)S_(2)O_(8)`
C. `SO_(2)^(2+) gt SO_(4)^(2-) gt SO_(3)^(-2) gt HSO_(4)^(-)`
D. `H_(2)SO_(5) gt H_(2)SO_(3) gt SCl_(2) gt H_(2)S`

Answer

D

Explanation

Oxidation is the addition of electronegative element or removal of electropositive elements.
`Cl_(2)+2KI to 2KCl+I_(2)`
In this reaction, the underlined species is oxidised as it involves the removal of electropositive element,