Question detail
Which acid is used to treat phosphate rock to produce soluble salts?
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. Sulfuric acid
- B. Nitric acid
- C. Phosphoric acid
- D. Hydrochloric acid
Answer
The correct option is Phosphoric acid. 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 Phosphoric acid. Phosphoric acid 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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