Which one of the following catalyses the reaction between iodide and persulphate ions `(2I^(-) + S_(2)O_(8)^(2-) rarr I_(2) + 2SO_(4)^(2-))`

Options

A. Fe(III)
B. Fe(II)
C. Fe(0)
D. Cr(III)

Answer

A

Explanation

`2Fe^(3+) + 2I^(-) rarr 2Fe^(2+) + I_(2)`
`2Fe^(2+) + S_(2)O_(8)^(2-) rarr 2Fe^(3+) + 2SO_(4)^(2-)`