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

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

Why are some fertilisers described by N-P-K numbers but sold as a “blended” fertiliser rather than a single chemical compound?

Which industrial catalyst is commonly used in the Haber process to increase the rate of ammonia production?

Calculate the approximate mass percent of potassium in potassium chloride (K = 39.1, Cl = 35.5). Which value is closest?

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

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

Which calculation gives the approximate mass of potassium in 100 kg of potassium chloride (KCl) if K comprises about 52% by mass?

Which one of the following is NOT one of the “big three” macronutrients supplied by NPK fertilisers?

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?