Solution:Biogas (marsh gas or compost gas) is a naturally occurring and renewable source of energy, resulting from the breakdown of organic matter (agricultural waste, manure, plant material, sewage and food waste). Destructive distillation - It is the process of separation of solid components from a mixture by heating in the absence of air. Examples: Coal tar, coke, oils and gases. Fractional distillation involves the separation of miscible liquids. Its process involves repeated condensation and distillation. Examples: Production of high-purity silicon from chlorosilanes. Dry distillation - It is the process of heating solid materials to produce gaseous products. Examples: Wood, oil shale and coal.
