Question

Mixed fertilizer having its grade designated by 5-25-10, means:

• A. the fertilizer contains 5% by weight elemental nitrogen, 25% by weight P\(_2\)O\(_5\), and 10% by weight K\(_2\)O
• B. the fertilizer contains 5% by weight ammonia, 25% by weight phosphoric acid, and 10% by weight potassium chloride
• C. the fertilizer contains 5% by weight K\(_2\)O, 25% by weight NH\(_3\), and 10% by weight P\(_2\)O\(_5\)
• D. the fertilizer contains 5% by weight P\(_2\)O\(_5\), 25% by weight NH\(_4\)Cl, and 10% by weight K\(_2\)O

Hint:

Fertilizer grades represent the percentage by weight of nitrogen, phosphorus, and potassium (N-P-K).

Answer 1

The Correct Option is A

Step 1: Understanding fertilizer grades.
The grade of a fertilizer indicates the percentage by weight of the primary nutrients: nitrogen (N), phosphorus (P), and potassium (K). The grade 5-25-10 means the fertilizer contains 5% nitrogen (N), 25% phosphorus (P\(_2\)O\(_5\)), and 10% potassium (K\(_2\)O).

Step 2: Explanation of options.
- (A) This correctly describes the composition of the mixed fertilizer with the given grade. - (B) and (C) These options do not correctly describe the composition for this grade. - (D) This option incorrectly lists the components of the fertilizer.

Final Answer: \[ \boxed{\text{A) the fertilizer contains 5% by weight elemental nitrogen, 25% by weight P\(_2\)O\(_5\), and 10% by weight K\(_2\)O}} \]