D. Is a strong disinfectant and leaves no harmful residue
Answer: Option D
Solution (By JKExamLibrary)
Ozone (O₃) is a more powerful oxidant than chlorine; it destroys bacteria, viruses, and organic contaminants, and then decomposes to oxygen, leaving no residual taste or toxic disinfection by-products. However, it does not provide lasting protection in distribution pipes, so a small chlorine dose may be added. Ozonation also removes color and odor.
Explanation:
Endothermic reactions absorb heat from the surroundings. The decomposition of calcium carbonate (CaCO₃ → CaO + CO₂) requires continuous heating to proceed. Burning of gas, respiration, and the reaction of sodium with water are all exothermic reactions that release significant amounts of heat energy to the surroundings.
Explanation:
NPK is a mixed (complex) fertilizer containing nitrogen, phosphorus, and potassium. Urea is a straight nitrogenous fertilizer. Ammonium sulfate is nitrogenous. Superphosphate is phosphatic. Mixed fertilizers supply two or more primary nutrients. They can be granulated or blended. DAP provides N and P, but NPK provides all three.
Explanation:
Water (H₂O) is a compound – a pure substance composed of two or more elements chemically combined in a fixed ratio. Oxygen is an element. Air is a mixture of gases. Steel is an alloy (mixture). Compounds can be broken down by chemical methods.
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