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Q48 (NDA-II/2016) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry Answer Verified

The LPG cooking gas contains propane and butane as the constituents. A sulfur containing compound is added to the LPG, because

Result
Your answer: —  Â·  Correct: C
Explanation

Liquefied Petroleum Gas (LPG) is primarily composed of propane and butane, which are naturally odorless and colorless hydrocarbons [1]. Because these gases are highly flammable and pose a significant explosion risk if they accumulate, a safety measure is required to alert users of leaks [4]. A sulfur-containing compound, most commonly ethyl mercaptan (also known as ethanethiol), is added as an odorant [3]. This compound has an extremely low odor threshold and a distinctive, pungent smell often described as skunk-like or rotten eggs. The primary purpose of this additive is to facilitate the easy detection of gas leakage by providing a warning scent, as the base hydrocarbons cannot be detected by the human nose [4]. It does not affect the efficiency, cost, or liquefaction process of the fuel.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.2.2 Chains, Branches and Rings > p. 64
  2. [4] https://pmc.ncbi.nlm.nih.gov/articles/PMC10504204/
  3. [2] https://www.sciencedirect.com/topics/engineering/odorization
  4. [3] https://nj.gov/health/eoh/rtkweb/documents/fs/0894.pdf
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SIMILAR QUESTIONS

CAPF · 2008 · Q11 Relevance score: 1.45

Consider the following statements— 1. The main constituent of LPG is Butane. 2. The main constituent of Biogas is Methane. Which of the statements given above is/are correct ?

IAS · 2005 · Q61 Relevance score: -1.12

Consider the following statements: 1. Liquefied Natural Gas (LNG) is liquefied under extremely cold temperatures and high pressure to facilitate storage or transportation in specially designed vessels. 2. Fist LNG terminal in India was built in Hassan. 3. Natural Gas Liquids (NGL) are separated from LPG and these include ethane, propane, butane and natural gasoline. Which of the statements is/are correct?

CDS-I · 2006 · Q50 Relevance score: -3.03

Assertion (A): The main component of natural gas is butane. Reason (R): Butane is easily liquified under pressure