ANS:C - urea

The Monte Catini process is used for the manufacture of phosphoric acid. The Monte Catini process, also known as the wet process, is a method for the production of phosphoric acid from phosphate rock. In this process, phosphate rock is treated with sulfuric acid to produce phosphoric acid along with calcium sulfate (gypsum) as a by-product. The phosphoric acid produced is then purified and concentrated for various industrial applications, including the production of fertilizers, detergents, and food additives. So, the correct option is: phosphoric acid Urea is a compound with the chemical formula CO(NH2)2, and it is the most widely used nitrogen fertilizer worldwide. It is a white, crystalline solid that is highly soluble in water, making it easy to apply to crops through irrigation or as a foliar spray. Here are some key points about urea:

1. Composition: Urea is composed of carbon, nitrogen, hydrogen, and oxygen atoms. Its chemical structure consists of two amine groups (NH2) attached to a carbonyl group (CO) via a nitrogen atom.
2. Nitrogen Content: Urea contains a high concentration of nitrogen, with a nitrogen content of approximately 46% by weight. This high nitrogen content makes urea an efficient and economical source of nitrogen fertilizer for plants.
3. Manufacturing Process: Urea is produced industrially through the reaction of ammonia (NH3) with carbon dioxide (CO2) under high pressure and temperature conditions. This reaction forms ammonium carbamate, which then decomposes into urea and water. The process typically involves the use of a catalyst to facilitate the reaction.
4. Role as Fertilizer: Urea is used extensively in agriculture as a source of nitrogen for plants. When applied to the soil or foliage, urea undergoes hydrolysis, a process in which it is broken down by soil enzymes into ammonium ions (NH4⁺) and bicarbonate ions (HCO3⁻). The ammonium ions are then converted into nitrate ions (NO3⁻) by soil bacteria through a process called nitrification. These nitrate ions are readily absorbed by plant roots and used for growth and development.
5. Advantages: Urea is a popular fertilizer choice due to its high nitrogen content, solubility in water, and ease of handling and application. It provides a readily available source of nitrogen for plants and can be used on a wide range of crops and soil types.
6. Considerations: While urea is an effective fertilizer, it can also pose challenges if not used properly. Urea is susceptible to nitrogen loss through volatilization, a process in which ammonia gas is released into the atmosphere. To minimize nitrogen loss, urea should be applied under appropriate soil and weather conditions, and it may be beneficial to incorporate it into the soil or use urease inhibitors to