In the balanced chemical reaction,IO3- + aI- + bH+ → CH2O + dI2a, b, c and d respectively correspond to

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5, 6, 5, 5

5, 3, 6, 3

3, 5, 3, 6

5, 6, 3, 3

answer is D.

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Detailed Solution

IO3- + aI- + bH+ → CH2O + dI2I-1 → I2 oxidation2I-1 → I2 2I-1 → I2 +2e----(1)IO3- → I2 reduction2IO3-→I22IO3- + 12H+→ I2 + 6H2O2IO3- + 12H+ +10e-→ I2 + 6H2O ---(2) (2) ⇒ 2IO3-+10e-+12H+→ I2 + 6H2O (1)×5⇒ 10I-→ 5I2 +10e- On addition: 2IO3-+10I-+12H+→ 6I2 + 6H2O IO3-+5I-+6H+→3I2+3H2OOn comparing, a = 5, b = 6, c = 3, d = 3

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