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1 CHEMISTRY MCQS

LPG consists mainly of: ?

  • Methane, Ethane & Hexane
  • Ethane, Hexane & Nonane
  • Methane, Butane & Propane
  • All of these
Correct Answer: C. Methane, Butane & Propane

Detailed Explanation

Liquefied Petroleum Gas (LPG) is a fuel mixture mainly made up of butane (C₄H₁₀) and propane (C₃H₈), with small traces of other hydrocarbons. These gases are stored under moderate pressure as liquids, which makes them easy to transport and store in cylinders or tanks. When released from its container, LPG quickly evaporates into a gas and can be burned as fuel.


Methane (C₁H₄) is the primary component of natural gas, not LPG, but in some cases small amounts of methane may be present. The main reason LPG is based on butane and propane is because these gases are heavier than methane and can be liquefied under relatively low pressure, making them ideal for storage and use in portable containers.


LPG is widely used in household cooking, heating, and as a fuel for certain types of vehicles. It burns cleanly, producing mainly carbon dioxide and water, which makes it a more environmentally friendly option compared to coal or wood. However, like all fossil fuels, it still releases greenhouse gases and must be handled with care.


Chemically, propane and butane are alkanes, part of the saturated hydrocarbon family. They are highly flammable and release a large amount of energy when burned. This high energy density is one reason LPG is such an efficient fuel source.


To make LPG safer for household use, a small amount of ethyl mercaptan (a sulfur compound) is added. This gives LPG a distinctive smell, helping users detect leaks quickly, as both propane and butane are naturally odorless.


In short, while natural gas is mainly methane, LPG consists mainly of butane and propane, sometimes with small traces of methane, making it a versatile and widely used fuel in everyday life.

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