SENAPREP
Natural Fertilizers Questions
Chapter: Fertilizers | Total Available: 3 Real Questions
Which one of the following statements aboutfertilizers is not correct?
Correct Answer
📖 Governing Law / Core Concept
Urea (CO(NH2)2) is classified as a nitrogenous fertilizer and is not a phosphorus-containing compound.
🧪 Step-by-Step Breakdown
Urea is synthesized through the reaction of ammonia (NH3) and carbon dioxide (CO2) under high pressure and temperature:
Urea's high nitrogen content makes it effective in enhancing soil fertility but does not contribute phosphorus.
🔍 Option Analysis
B: Fertilizers increase soil fertility. C: Urea can be produced as stated. D: Urea typically has higher nitrogen content than many other fertilizers.
⚡ Mnemonic / Speed-Run
Remember: "Urea = Nitrogen, No Phosphorus." This helps recall that urea is strictly a nitrogen fertilizer.
6. Visual Suggestion
6. Visual Suggestion
A table comparing nitrogenous fertilizers (like Urea) and phosphorus fertilizers (like Superphosphate), highlighting their chemical compositions.
📖 Factual Verification & Reference
Verified against NCERT Class XII Chemistry, Chapter on Fertilizers.
Which one of the following fertiliser is a source of nitrogen?
Correct Answer
📖 Governing Law / Core Concept
The primary source of nitrogen in fertilizers is urea, represented by the chemical formula NH2CONH2.
🧪 Step-by-Step Breakdown
Urea is synthesized through the Haber-Bosch process, which combines nitrogen and hydrogen:
This ammonia can then be reacted to form urea:
Urea dissolves in water, releasing nitrogen for plant uptake, contributing to effective growth.
🔍 Option Analysis
- A: Superphosphate - Contains phosphorus, not nitrogen.
- B: Potassium sulfate - Primarily contributes potassium.
- C: Bonemeal - High in phosphorus and calcium.
⚡ Mnemonic / Speed-Run
Remember: "Urea = U + Reactive Nitrogen".
6. Visual Suggestion
6. Visual Suggestion
A diagram comparing urea with other fertilizers, showing their nitrogen content with bar graphs for quick visual reference.
📖 Factual Verification & Reference
Verified against NCERT Class XII Chemistry, Chapter on Fertilizers.