Question

Which of the following mixtures is an NPK fertilizer?

• A. Potassium nitrate and Ammonium chloride
• B. Calcium phosphate and Ammonium nitrate
• C. Potassium chloride and Ammonium phosphate
• D. Sodium nitrate and Calcium phosphate

Answer 1

The correct option is C

Potassium chloride and Ammonium phosphate

NPK fertilizers:

1. NPK fertilizers are mixed fertilizers containing Nitrogen, Phosphorous and Potassium(NPK) in different proportions, which are required for promoting plant growth and high crop yields.
2. Among the given options, option (c) is correct and all the remaining options are incorrect as they do not contain all the three elements of NPK fertilizer.
3. In option (c) Potassium chloride($\mathrm{KCl}$) and Ammonium phosphate(${\left({\mathrm{NH}}_4\right)}_3{\mathrm{PO}}_4$) contains all the three elements Nitrogen, Phosphorous and Potassium.
4. Therefore, it is an NPK fertilizer in the following mixtures.

Hence, the option (c) is correct. i.e., Potassium chloride and Ammonium phosphate mixtures is an NPK fertilizer.