Carbon and Fossil Fuels

Cracking is the industrial process of breaking down large, complex hydrocarbon molecules into smaller, more useful ones using heat and catalysts. The other terms listed are not standard chemical processes for this action.

Anthracite is the highest rank of coal, containing the highest carbon content (typically over 85-90%) and the lowest moisture content, which makes it burn cleaner and hotter than other types like lignite or bituminous coal.

Primary fuels are found in nature, such as coal, wood, or natural gas. Kerosene is a refined product derived from petroleum, making it a secondary fuel.

Cracking is the industrial process used in petroleum refineries to break down large, heavy hydrocarbon molecules into smaller, more useful ones using heat and catalysts.

Petrol is less dense than water and is immiscible with it. If water is poured on a petrol fire, the petrol floats on top of the water and continues to burn, potentially spreading the fire.

Ethanol is the alcohol blended with petrol in India as part of the Ethanol Blended Petrol (EBP) programme to reduce dependence on imported crude oil and lower emissions. Other alcohols like butanol or methanol are not the primary focus of these national blending mandates.

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Ethanol is a biofuel produced through the fermentation of sugars found in starchy materials (like corn or sugarcane) and agricultural waste like bagasse.

High-quality fuel wood should have high calorific value, low moisture content, and burn steadily without excessive sparking or splitting. Option D describes the ideal characteristics for efficient combustion.

Burning of candles and and fuels is an example of rapid oxidation.

The unburnt particles released during combustion of fuels are called soot.

Incomplete combustion of charcoal in a closed space produces carbon monoxide, a colorless, odorless, and highly toxic gas that binds to hemoglobin more strongly than oxygen, leading to suffocation.

Coal and petroleum are huge reservoirs of carbon. 

Compressed Natural Gas (CNG) is widely used as a cleaner-burning alternative fuel for vehicles compared to traditional gasoline or diesel.

LPG (Liquefied Petroleum Gas) is a cleaner-burning fuel compared to wood, petrol, or kerosene. It produces fewer particulate emissions and pollutants when combusted.