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 |
An incorrect statement among the following regarding hydrogen is:
1. | Hydrogen never acts as a cation in ionic salts. |
2. | Hydronium ion, H3O+ exists freely in a solution. |
3. | Dihydrogen does not act as a reducing agent. |
4. | Hydrogen has three isotopes of which protium is the most common. |
The pair that on reaction will not evolve gas is
1. Copper and HCl (aqueous)
2. Iron and steam
3. Iron and (aqueous)
4. Sodium and ethyl alcohol