Which of the following statements are NOT correct? A. Hydrogen is used to reduce heavy metal oxides to metals. B. Heavy water is used to study reaction mechanism. C. Hydrogen is used to make saturated fats from oils. D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any elements. E. Hydrogen reduces oxides of metals that are more active than iron. Choose the most appropriate answer from the options given below:
(1) B, C, D only
(2) B, D only
(3) D, E only
(4) A, B, C only
Statement D is incorrect because the H-H bond dissociation enthalpy is actually very high (), not the lowest. Statement E is incorrect because hydrogen can only reduce oxides of metals less active than iron (like Cu, Pb, etc.), not those more active than iron. Thus, D and E are the incorrect statements.
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