Question detail
What is produced when phosphate rock is treated with phosphoric acid?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The Haber process and the use of NPK fertilisers
Question
- A. Soluble salts for fertilisers
- B. Nitric acid
- C. Ammonium salts
- D. Potassium chloride
Answer
The correct option is Soluble salts for fertilisers. This answer is correct because it matches the approved learning objective to describe treatment of phosphate rock with phosphoric acid to produce soluble salts for fertilisers. (Chemistry only) in the subtopic Production and uses of NPK fertilisers.
Explanation
The correct option is Soluble salts for fertilisers. Soluble salts for fertilisers is correct because it directly supports the approved learning objective to describe treatment of phosphate rock with phosphoric acid to produce soluble salts for fertilisers. (Chemistry only). This belongs to the subtopic Production and uses of NPK fertilisers within The Haber process and the use of NPK fertilisers, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Production and uses of NPK fertilisers.
Common mistake
Confusing Phosphate Rock Treatment
Students often confuse the treatment of phosphate rock with phosphoric acid with treatments using nitric or sulfuric acid.
Remember that phosphoric acid specifically produces soluble salts from phosphate rock, while nitric and sulfuric acids produce different salts.
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