One mole of CaOCl2 is dissolved in water and excess of KI added. Hypo Na2S2O3 required to react with the oxidized part completely is

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1 mole

2.0 moles

1.5 moles

2.5 moles

answer is B.

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Detailed Solution

CaOCl2 + H2O → CaOH2 + Cl21 mol 1 molCl2 + 2KI → 2KCl + I2 1 moleI2 + KI ⇌ KI3 I2 in KI + 2Na2S2O3 → 2NaI + Na2S4O6

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