Which of the following does not decolouries iodine ?

Options

A. Excess of `Cl_(2)` water
B. Excess of `Na_(2)S_(2)O_(3)` solution
C. Excess of `Br^(-)` solution
D. Excess of `NaOH` solution.

Answer

C

Explanation

`I_(2) + aq. Cl_(2) rarr IO_(3)^(-) + Cl^(-)`,
`I_(2) + S_(2)O_(3)^(2-) rarr I^(-) + S_(4)O_(6)^(2-)`
`I_(2) + NaOH rarr NaIo_(3) + Nal`
`I_(2) + Br^(-) rarr` No reaction.