Production And Uses Of Npk Fertilisers (chemistry Only) (GCSE Chemistry)

Which of the following is the correct balanced equation showing production of (single) superphosphate from apatite (simplified) when treated with sulfuric acid?

Which of these salts supplies both nitrogen and phosphorus when used as a fertiliser?

Which agricultural practice helps reduce nitrate leaching from fields after fertiliser application?

Which processing acid is used to make “triple superphosphate” (a concentrated P fertiliser) from phosphate rock?

During the Ostwald process for making nitric acid from ammonia, what is the initial gaseous oxidation product formed from ammonia over a platinum catalyst?

Phosphorus fertilisers are commonly made by treating phosphate rock with sulfuric acid. What is the main soluble phosphate product called?

Which of the following is a direct human health risk of drinking water with high nitrate levels from fertiliser runoff?

Which of the following is a major hazard associated with storing large quantities of ammonium nitrate fertiliser?

A soil analysis shows N = 0.05% and K = 0.03% (both low), while P is adequate. A farmer wants to correct both low N and K cheaply. Which practical choice is best?

What environmental problem is most directly caused by excessive application or runoff of N and P fertilisers into rivers and lakes?

If a fertiliser label shows "10-20-10" (N-P-K), what do these numbers mean?