Cooking gas stove uses gas as fuel :

Question

Accepted Answer

The correct option is 4:

The gas universally used in domestic cooking stoves, supplied in pressurized cylinders, is Liquified Petroleum gas (LPG). LPG is not a single gas but a flammable mixture of hydrocarbon gases, primarily propane ($\text{C}\_3\text{H}\_8$) and butane ($\text{C}*4\text{H}*{10}$). These gases are derived from petroleum refining and natural gas processing. The conceptual reasoning for its use lies in its high calorific value, which means it releases a large amount of heat energy per unit of mass, making it an efficient and fast source of heat for cooking. Furthermore, propane and butane can be easily compressed and stored as a liquid at relatively low pressures in steel cylinders, which dramatically reduces their volume (LPG expands nearly 270 times from liquid to gas state). This liquefaction makes it convenient for transport and storage in homes and small spaces. For safety, LPG is naturally odorless, but a strong-smelling agent like ethanethiol is intentionally added to it. This ensures that any leak is immediately detectable by its distinct, pungent odor, which is a critical safety feature in a residential setting, solidifying LPG as the dominant choice for domestic cooking fuel worldwide.

The incorrect option is 1:

Liquified Hydrogen gas is not used in common cooking stoves primarily due to its severe storage challenges and high cost. While hydrogen is an exceptionally clean, high-energy fuel, it must be cooled to cryogenic temperatures, specifically below $-253^\circ	ext{C}$ ($-423^\circ	ext{F}$), to be stored as a liquid. Maintaining these extremely low temperatures for domestic storage in ordinary kitchen settings is technically demanding, impractical, and prohibitively expensive for routine use. Furthermore, hydrogen gas is odorless, and its molecules are very small, making it notoriously difficult to contain and prone to leaking from standard fittings and valves. The safety risks and infrastructural requirements associated with cryogenic storage and its non-detectable nature in a domestic environment rule it out as a viable consumer cooking fuel option.

The incorrect option is 2:

Liquified Peroxide gas is a term that does not refer to a standardized commercial fuel gas. Peroxides are highly unstable compounds that contain an oxygen-oxygen single bond (like hydrogen peroxide, $	ext{H}_2	ext{O}_2$), which makes them potent oxidizers. In their gaseous state, or even as high-concentration liquids, they are chemically reactive and inherently dangerous, often used in controlled environments as propellants or strong bleaching agents, not as a fuel for burning in a stove. Using such a highly reactive and unstable substance for routine domestic cooking would pose an unacceptable and extreme risk of explosion or fire due to its instability. Therefore, this chemical class is entirely unsuitable for a gas stove fuel, which requires a stable, easy-to-control, combustible hydrocarbon mix.

The incorrect option is 3:

Liquified Paraffin gas is not the correct technical or commercial designation for the domestic cooking fuel. The term 'paraffin' is generally used as a common name for the alkane series of hydrocarbons, which *includes* the components of LPG (propane and butane are technically alkanes/paraffins). However, in common usage, 'paraffin' is more frequently associated with the liquid fuel kerosene (paraffin oil) or the solid wax used for candles. Even though the gaseous components of LPG are chemically 'paraffinic' in nature, the specific, globally standardized product sold in cylinders for stoves is correctly termed **Liquified Petroleum Gas (LPG)**. Using the ambiguous and non-standard 'Liquified Paraffin gas' makes this option factually imprecise and incorrect in a commercial and scientific context, distinguishing it from the universally accepted industry term, LPG.