Question

Which of the following statements are not correct?

1. Hydrogen is used to reduce heavy metal oxides to metals.
2. Heavy water is used to study reaction mechanism.
3. Hydrogen is used to make saturated fats from oils.
4. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.
5. Hydrogen reduces oxides of metals that are more active than iron.

Choose the most appropriate answer from the options given below:

पर्याय

• B, D only

• D, E only

• A, B, C only

• B, C, D, E only

Answer 1

D, E only

Explanation:

(D) H-H bond strength/bond dissociation energy/bond energy of H cannot be the lowest because the bond formed between hydrogen atoms is due to the overlapping of 1s-1s.

(E) Hydrogen cannot reduce oxides of highly reactive metals.