Which of the following fertilizers provides both nitrogen and phosphorus?
A. Ammonium sulfate
B. Muriate of potash
C. Diammonium phosphate (DAP)
D. Urea
Answer: Option C
Solution (By JKExamLibrary)
Diammonium phosphate (DAP), with the formula (NH4)2HPO4, is a widely used complex fertilizer. It provides two essential macronutrients: nitrogen (from the ammonium ion) and phosphorus (from the phosphate ion). Urea and ammonium sulfate provide only nitrogen, while muriate of potash provides potassium.
Explanation:
Sodium (Na) is a soft, silvery-white alkali metal (Group 1). It is highly reactive, conducts electricity, and is malleable. Sulfur and phosphorus are non-metals; chlorine is a non-metal halogen gas. Sodium is never found free in nature; it is stored under kerosene to prevent reaction with air/moisture. It reacts vigorously with water, producing NaOH and H₂.
Explanation:
Na₂CO₃ reacts with Ca²⁺/Mg²⁺ to form insoluble CaCO₃/MgCO₃, which are removed. This is permanent hardness removal. Boiling works for temporary hardness. Ion exchange is another method.
Explanation:
Natural gas is predominantly methane (CH₄), typically 70-95%. Ethane, propane, butane are minor components. CNG is compressed natural gas.
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