A. | Hydrogen is used to reduce heavy metal oxides to metals. |
B. | Heavy water is used to study the 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 element. |
E. | Hydrogen reduces oxides of metals that are more active than iron. |
1. | A, B, C only | 2. | B, C, D, E only |
3. | B, D only | 4. | D, E only |