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Q103 (CAPF/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

Consider the following statements: 1. The 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. 2. The preparation of ammonia by Haber process is an endothermic reaction. 3. Urea 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?

Result
Your answer: —  Â·  Correct: C
Explanation

Statement 1 is correct as the nitrogen cycle describes the circulation of nitrogen from inorganic soil compounds to organic proteins in plants and animals, eventually returning to the soil [3]. Statement 2 is incorrect; the Haber process (N2 + 3H2 ⇌ 2NH3) is an exothermic reaction, meaning it releases heat (ΔH = -92.4 kJ/mol). Industrially, it uses an iron catalyst at high pressure and moderate temperature to optimize yield. Statement 3 is correct; urea (NH2CONH2) is synthetically produced via the Bosch-Meiser process, which involves the reaction of ammonia and carbon dioxide at high temperature (170-190°C) and high pressure (130-200 bar) to form ammonium carbamate, which then dehydrates to urea. Since the question asks for the statement that is NOT correct, only statement 2 fits the criteria.

Sources

  1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 2: Functions of an Ecosystem > s r n r u l z N ,- / & f . -. : : u ' , \ S ACADEMY * d 6 # . , r '' t u f Y l ' ' J * w { d ) / u Y . / > p. 20
  2. [3] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.2 > p. 83
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SIMILAR QUESTIONS

IAS · 2019 · Q41 Relevance score: 0.99

Consider the following statements : 1. Agricultural soils release nitrogen oxides into environment. 2. Cattle release ammonia into environment. 3. Poultry industry releases reactive nitrogen compounds into environment. Which of the statements given above is/are correct?

CDS-I · 2011 · Q86 Relevance score: -1.44

Consider the following statements about black soil of India : 1. Black soil becomes sticky when it is wet. 2. Black soil contains adequate nitrogen as well as phosphorus required for the growth of plants. Which of the statements given above is/are correct?

IAS · 2013 · Q9 Relevance score: -2.04

Which of the following adds/add nitrogen to the soil ? 1. Excretion of urea by animals 2. Burning of coal by man 3. Death of vegetation Select the correct answer using the codes given below.

IAS · 2020 · Q29 Relevance score: -2.11

Consider the following statements : 1. Coal ash contains arsenic, lead and mercury. 2. Coal-fired power plants release sulphur dioxide and oxides of nitrogen into the environment. 3. High ash content is observed in Indian coal. Which of the statements given above is/are correct ?

CAPF · 2014 · Q123 Relevance score: -2.11

Consider the following statements describing the functions of plants : 1. Photosynthesis is a process to convert light energy from the Sun into chemical energy i.e., Carbohydrates are synthesized from carbon dioxide and water using sun light 2. Fermentation or Zymology is a metabolic process that converts carbohydrate to alcohols and carbon dioxide Which of the statements given above is/ are correct ?