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JEE Main & Advanced Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank Redox reaction and Method for balancing redox reaction

  • question_answer
    In the balanced chemical reaction,                 \[IO_{3}^{-}+a\ {{I}^{-}}+b\ {{H}^{+}}\to c\ {{H}_{2}}O+d\ {{I}_{2}}\] a, b, c and d respectively correspond to [AIIMS 2005]

    A)                 5, 6, 3, 3               

    B)                 5, 3, 6, 3

    C)                 3, 5, 3, 6               

    D)                 5, 6, 5, 5

    Correct Answer: A

    Solution :

               IO3? + aI? + bH+ ® cH2O + dI2                    Step 1 : I?1 ® I2 (oxidation)                    IO3? ® I2 (reduction)                    Step 2 : 2IO3? + 12H+ ® I2 + 6H2O                    Step 3 : 2IO3? + 12H+ + 10e ® I2 + 6H2O                    2I? ® I2 + 2e                    Step 4 : 2IO3? + 12H+ + 10e? ® I2 + 6H2O                    [2I? ® I2 + 2e]5                    Step 5 : 2IO3? + 10I? + 12H+ ® 6I2 + 6H2O                    IO3? + 5I? + 6H+ ® 3I2 + 3H2O                                 On comparing, a = 5, b = 6, c = 3, d = 3


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