Question detail
For phosphate-rock reactions used in fertiliser manufacture, which salt name is linked with phosphoric acid treatment?
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. Calcium phosphate
- B. Ammonium phosphate
- C. Calcium nitrate
- D. Ammonium sulfate
Answer
The correct option is Calcium phosphate. Calcium phosphate is correct for the phosphoric-acid treatment context. Calcium nitrate links to nitric acid, while ammonium phosphate and ammonium sulfate are distractors from other fertiliser chemistry, not this phosphate-rock salt naming point.
Explanation
The correct option is Calcium phosphate. Calcium phosphate is correct for the phosphoric-acid treatment context. Calcium nitrate links to nitric acid, while ammonium phosphate and ammonium sulfate are distractors from other fertiliser chemistry, not this phosphate-rock salt naming point. This keeps the answer anchored to AQA GCSE Chemistry Unit 4.10 Using resources and avoids confusing neighbouring resource, material, water-treatment, LCA, Haber process or fertiliser ideas.
Common mistake
Common Mistake in Salt Names
Students often confuse the names of salts produced from phosphate rock reactions with different acids.
To fix this, students should memorize the specific salts formed from each acid: for nitric acid, it's calcium nitrate; for sulfuric acid, it's calcium sulfate; and for phosphoric acid, it's calcium phosphate.
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