In the reaction,
`I_(2)+2S_(2)O_(3)^(2-) rarr 2I^(-)+S_(4)O_(6)^(2-)`.
Equivalent wieght of iodine will be equal to

Options

A. `I_(2)` is reducing agent.
B. `I_(2)` is oxidising agent and `S_(2)O_(3)^(2-)` is reducing agent
C. `S_(2)O_(3)^(2-)` is oxidising agent.
D. `I_(2)` is reducing agent and `S_(2)O_(3)^(2-)` is oxidising agent.

Answer

B

Explanation

`overset(0)I_(2) rarr overset(-2)(2I^(-))`
`I_(2)` undergoes reduction hence acts as oxidising agent.
`S_(2)^(+2)O_(3)^(2-)rarrS_(4)^(+2.5)O_(6)^(2-)`
It undergoes oxidation hence acts as a reducing agent.