Which disinfectant is used in water treatment that does not leave any residual taste or odor? MCQ with Answer and Explanation

Explanation:
Methanol (CH₃OH) was historically produced by destructive distillation of wood, hence called wood alcohol. Ethanol is grain alcohol (from fermentation). Rubbing alcohol is isopropanol or denatured ethanol. Denatured alcohol is ethanol with added methanol or other substances to make it undrinkable. Methanol is toxic, used as solvent, fuel, and antifreeze.

Explanation:
Organic fertilizers (compost, manure, bone meal) add humus, improving soil structure, water retention, and aeration. They support beneficial microorganisms that slowly decompose organic matter, releasing nutrients gradually. Unlike synthetic fertilizers, they do not cause sudden nutrient spikes or soil acidification. Biofertilizers like Rhizobium fix nitrogen. Organic farming emphasizes sustainability and reduced chemical inputs.

Explanation:
Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting. Zinc acts as sacrificial anode. Tinning is coating with tin (tin cans). Anodizing is an electrochemical process for aluminum to form protective oxide. Electroplating can be with any metal. Galvanized iron is used for roofing sheets, water pipes.