Which statements are NOT correct? A. H₂ reduces heavy metal oxides to metals. B. D₂O is used to study reaction mechanism. C. H₂ is used to make saturated fats from oils. D. H–H bond enthalpy is lowest among all single bonds. E. H₂ reduces oxides of metals more active than iron.

Options

1. D,E only
2. A,B,C only
3. B,C,D,E only
4. B,D only

Correct Answer

B,C,D,E only

Explanation

H–H bond enthalpy is one of the highest, not lowest; hydrogen cannot reduce oxides of metals more active than Fe. Hence B, C, D, and E are incorrect.

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