Match List – I with List – II and select the correct answer using the codes given below the lists :

List – I (Fertilizer)	List – II (Nitrogen Content)
A. Urea	1. 24%
B. Diammonium Phosphate	2. 20%
C. Ammonium Sulphate	3. 18%
D. Ammonium Chloride	4. 46%

1. A

   A-4, B-3, C-2, D-1

2. B

   A-4, B-3, C-1, D-2

3. C

   A-1, B-2, C-4, D-3

4. D

   A-1, B-3, C-2, D-4

Appeared in: UPPSC 2017

Explanation

• Urea is a highly concentrated solid nitrogenous fertilizer, containing 46% nitrogen.
• Diammonium Phosphate (DAP) is a complex fertilizer containing two nutrients; it has 18% nitrogen and 46% phosphate (P₂O₅).
• Ammonium Sulphate contains approximately 20-21% nitrogen and is also a valuable source of sulfur for plants.
• Ammonium Chloride typically contains 24-26% nitrogen.
• Based on these facts, the correct matching is: Urea (A) with 46% (4), Diammonium Phosphate (B) with 18% (3), Ammonium Sulphate (C) with 20% (2), and Ammonium Chloride (D) with 24% (1).

Why Other Options Were Wrong

• Option B: This option incorrectly matches Ammonium Sulphate (C) with 24% nitrogen (1) and Ammonium Chloride (D) with 20% nitrogen (2). The correct percentages are the other way around.
• Option C: This option incorrectly matches Urea (A) with 24% nitrogen (1) and Ammonium Sulphate (C) with 46% nitrogen (4). Urea has the highest content (46%), not Ammonium Sulphate.
• Option D: This option incorrectly matches Urea (A) with 24% nitrogen (1) and Ammonium Chloride (D) with 46% nitrogen (4). Urea has 46% nitrogen, and Ammonium Chloride has 24%.

Related Visual

Clinical Relevance

• Nursing practice connection: Knowing Nitrogen content of common chemical fertilizers helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Knowing the nitrogen content of fertilizers is crucial for calculating the correct application rate for crops to ensure optimal growth without causing environmental pollution from nutrient runoff.
• The choice of fertilizer also depends on the soil type and the specific needs of the crop (e.g., using Ammonium Sulphate for sulfur-deficient soils).
• What if? - If a farmer needs to apply nitrogen to a chloride-sensitive crop like tobacco or potatoes, they should avoid Ammonium Chloride despite its high nitrogen content and choose an alternative like Urea or Ammonium Sulphate.

How to Approach the Question

• First, identify the core task: match each fertilizer in List-I with its corresponding nitrogen percentage in List-II.
• Recall or identify the fertilizer with the highest nitrogen content. Urea is widely known for having the highest N content (~46%) among solid fertilizers. This immediately matches A with 4.
• Scan the options. Any option that does not begin with 'A-4' can be eliminated. This leaves only the first two options.
• Examine the remaining options. Both have A-4 and B-3 (Diammonium Phosphate at 18%). The difference is in the matching for C and D.
• You need to differentiate between Ammonium Sulphate (C) and Ammonium Chloride (D). Recall that Ammonium Sulphate has about 20-21% N, making 20% (item 2) the correct match. This leads to C-2.
• This confirms the sequence A-4, B-3, C-2, D-1, which corresponds to the first option.

Concept Tested & Keywords

• Concept Tested: Nitrogen content of common chemical fertilizers.
• Stem keywords: Fertilizer, Nitrogen Content, Urea, Diammonium Phosphate, Ammonium Sulphate, Ammonium Chloride
• Lead-in keywords: Match List, select the correct answer

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