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Redox Reactions — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions1 Mark
MCQ
Thiosulphate reacts differently with iodine and bromine in the reactions given below:
$2\text{S}_2\text{O}^{2-}_3+\text{I}\xrightarrow{ \ \ \ \ \ \ \ }\text{S}_4\text{O}^{2-}_6+2\text{I}^{-}$
$\text{S}_2\text{O}^{2-}_3+2\text{Br}_2+5\text{H}_2\text{O}\xrightarrow{ \ \ \ \ \ \ \ }2\text{SO}^{2-}_4+2\text{Br}^{-}+10\text{H}^{+}$
Which of the following statements justifies the above dual behaviour of thiosulphate?
  • A
    Bromine is a stronger oxidant than iodine.
  • B
    Bromine is a weaker oxidant than iodine.
  • C
    Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions.
  • D
    Bromine undergoes oxidation and iodine undergoes reduction in these reactions.
✓

Answer

  1. Bromine is a stronger oxidant than iodine.

Explanation:

$2\text{S}_2\text{O}^{2-}_3(\text{aq})+\text{I}_2\text{(s)}\xrightarrow{ \ \ \ \ \ \ \ \ \ }\text{S}_4\text{O}^{2-}_6(\text{aq})+2\text{I}^{-}(\text{aq})$

$\text{S}_2\text{O}^{2-}_3(\text{aq})+2\text{Br}(\text{l})+5\text{H}_2\text{O}(\text{l})\xrightarrow{ \ \ \ \ \ \ \ \ \ }2\text{SO}^{2-}_4(\text{Aq})+4\text{Br}^{-}(\text{aq})+10\text{H}^{+}(\text{aq})$

Bromine being stronger oxidizing agent than I2, it oxidises S of S2O2-3 to SO2-4 whereas I2 oxidises it only into S4O2-6 ion.

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