- 1(current)
Q. No.Which of the following statements is NOT correct?
Choose the most appropriate answer from the options given below:
| 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 |
Subtopic: Â Preparation & Properties |
Level 3: 35%-60%
NEET - 2023
Hints
Subtopic: Â Preparation & Properties |
 66%
Level 2: 60%+
NEET - 2022
Hints
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. |
Subtopic: Â Preparation & Properties |
 66%
Level 2: 60%+
NEET - 2016
Hints
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
Subtopic: Â Preparation & Properties |
 54%
Level 3: 35%-60%
AIPMT - 1998
Hints
- 1(current)
Q. No.
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