Question detail
For Soluble salts, which reaction focus answer best supports this Unit 4.4 objective: Write word equations for soluble salt preparation reactions?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. Adding excess insoluble solid to the acid and filtering the mixture - correct reaction focus for soluble salt
- B. Wrong reaction focus: confuses soluble salt with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Soluble salts
- D. Wrong reaction link: does not support Write word equations for soluble salt preparation reactions
Answer
The correct option is Adding excess insoluble solid to the acid and filtering the mixture - correct reaction focus for soluble salt.
Explanation
The correct option is "Adding excess insoluble solid to the acid and filtering the mixture - correct reaction focus for soluble salt" because it supports the approved learning objective: Write word equations for soluble salt preparation reactions. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Soluble salts.
Common mistake
Misidentifying the solid reactant as the salt
Students write the insoluble solid (e.g. ZnS) as the product of the soluble salt preparation, rather than recognising it as the reactant that is added in excess
Explain that in a soluble salt preparation the insoluble solid is the reactant that reacts with the acid to form the soluble salt and a gas; the product is the soluble salt, not the solid that was added.
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