1.

Which of the following cannot decolourise the iodine solution ?A. Excess of `Cl_(2)` waterB. Excess of `Na_(2)S_(2)O_(3)` solutionC. Excess of `Br^(-)` solutionD. Excess of `NaOH` solution.

Answer» Correct Answer - C
`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.


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