2025 · Q103
Consider the following statements:
- 1The circulation of nitrogen from the inorganic compounds in the soil to form protein in plants and animals and back again is known as the nitrogen cycle.
- 2The preparation of ammonia by Haber process is an endothermic reaction.
- 3Urea is synthetically made by the action of ammonia and carbon dioxide under high temperature and high pressure.
Which of the statements given above is/are not correct?
general-sciencechemistry
- A1 and 3
- B2 and 3
- C2 only
- D1 only
Explanation
Statement 1 correctly describes the nitrogen cycle, and statement 3 correctly describes the Bosch-Meiser synthesis of urea from ammonia and carbon dioxide at high temperature and pressure. Statement 2 is wrong: the Haber process (N2+3H2 -> 2NH3) is exothermic (delta H negative), not endothermic. The question asks which are NOT correct, so the answer is statement 2 only.