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4.It has been found that gaseous iodine ...

4.It has been found that gaseous iodine molecule just dissociates into iodine atoms after absorption of light at wavelengths 4995 A°. The energy required to dissociate 1 mole of iodine molecules is (1) 52.2 kcal / mole (2) 93.4 kcal /mole (3) 63.4 Kcal/mole (4) 57.3 Kcal/mole ​

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