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 element.
E. Hydrogen reduces oxides of metals that are more active than iron.
Choose the most appropriate answer from the options given below:
- A
B, D only
- B
D, E only
- C
A, B, C only
- D
B, C, D, E only
Statement D is wrong: the H–H bond is in fact one of the strongest single bonds ( kJ/mol), not the weakest.
Statement E is wrong: hydrogen can reduce oxides of metals less reactive than itself (e.g. Cu, Fe, Pb); it cannot reduce oxides of metals more active than iron such as Na, Mg, or Al.
A, B, C are all correct uses of hydrogen / heavy water.
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