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CSS Solved Papers
Physics Chemistry

Engineering :: Chemical Technology

  Which one of the following reactions is not an exothermic
[A]. Absorption of sulphur troixide by 98.5% sulphuric acid[B]. Oxidation of sulphur trioxide
[C]. Oxidation of sulphur to sulphur dioxide[D]. Thermal dissociation of iron pyrites

Answer: Option D
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