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  • 1 Banaras Hindu University Nuclear and Radiochemistry Laboratory, Department of Chemistry, Faculty of Science 221 005 Varanasi (India)
  • 2 Benaras Hindu University Department of Chemistry, Faculty of Science 221 005 Varanasi India
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Abstract  

The isotopic exchange reaction of iodine in fused NaI–NaIO3 and KI–KIO3 systems, which does not proceed until the mixture is melted, is found to be almost instantaneous in homogeneous melts. The equilibrium is attained within a period of less than 5 min at a temperature 5°C above the melting temperature of each composition for both systems. No noticeable exchange is observed even after heating the samples for 30 min at a temperature 20°C below the corresponding melting point. A single-step bimolecular association-dissociation mechanism is proposed for the exchange.