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(2a) (i)Higher nutrient content: Poultry droppings have a higher nutrient content compared to cow dung, making them a more effective fertilizer. (ii)Faster decomposition: Poultry droppings decompose faster than cow dung, making the nutrients available to plants more quickly. (2b) (i)Burning of young seedlings: Poultry droppings can be too hot for young seedlings and can cause burning or scorching, leading to poor germination and growth. (2c) (i)Improves soil structure: Cow dung helps to improve soil structure, making it more conducive for plant growth. (ii)Increases soil fertility: Cow dung adds nutrients to the soil, increasing its fertility and ability to support plant growth. (iii)Supports beneficial microbes: Cow dung provides a food source for beneficial microorganisms in the soil, promoting a healthy soil ecosystem. (2d) (i)Soil degradation: Continuous use of N.P.K Fertilizer can lead to soil degradation, reducing its fertility and structure. (ii)Water pollution: N.P.K Fertilizer can leach into water sources, causing pollution and harm to aquatic life. (iii)Soil acidification: N.P.K Fertilizer can acidify the soil, reducing its pH and making it less conducive for plant growth. (2e) (i)Broadcasting: Spreading the fertilizer evenly over the soil surface. (ii)Banding: Applying the fertilizer in a narrow band along the planting row. (iii)Fertigation: Applying the fertilizer through irrigation water. (2f) (i)Gypsum (ii)Dolomite (iii)Calcium nitrate

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(3a) (i)The salt solution was acidic in nature, as it reacted with sodium trioxocarbonate(IV) (sodium carbonate) to produce effervescence and a white precipitate. (ii)The salt solution contained a calcium or magnesium ion, as these ions form a white precipitate with sodium carbonate. (iii)The reaction was exothermic, as the test tube became warm, indicating the release of heat energy. (3b) (i) PbSO4 (lead(II) sulfate) would not readily dissolve in water, as it is insoluble in water. (ii) NaHCO3 (sodium hydrogen carbonate) produces effervescence with dilute mineral acids, as it reacts with acids to produce carbon dioxide gas. (iii) NH4Cl (ammonium chloride) decomposes on heating, as it breaks down into ammonia and hydrogen chloride gases. (iv) NaHCO3 (sodium hydrogen carbonate) dissolves in water to form an alkaline solution, as it is a basic salt. (v) NH4Cl (ammonium chloride) sublimes on heating, as it changes directly from a solid to a gas without going through the liquid phase.

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