Question detail
Why can't phosphate rock be used directly as a fertiliser?
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. It is too expensive
- B. It is insoluble
- C. It is toxic
- D. It is not abundant
Answer
The correct option is It is insoluble. This answer is correct because it matches the approved learning objective to recall that phosphate rock is obtained by mining but cannot be used directly as a fertiliser. (Chemistry only) in the subtopic Production and uses of NPK fertilisers.
Explanation
The correct option is It is insoluble. It is insoluble is correct because it directly supports the approved learning objective to recall that phosphate rock is obtained by mining but cannot be used directly as a fertiliser. (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
Phosphate Rock Usage
Students often think that phosphate rock can be used directly as a fertiliser.
Remember that phosphate rock must be treated to produce soluble salts before it can be used as a fertiliser.
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