Question detail
For Soluble salts, which exam wording answer best supports this Unit 4.4 objective: Write balanced symbol equations for soluble salt preparation when formulae are supplied?
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. To ensure complete reaction - correct exam wording for soluble salt
- B. Wrong exam wording: 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 balanced symbol equations for soluble salt preparation when formulae are supplied
Answer
The correct option is To ensure complete reaction - correct exam wording for soluble salt.
Explanation
The correct option is "To ensure complete reaction - correct exam wording for soluble salt" because it supports the approved learning objective: Write balanced symbol equations for soluble salt preparation when formulae are supplied. 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
Incorrectly balancing the equation for soluble salt preparation
Students often write the balanced symbol equation for a soluble salt preparation as 2NaCl + H2SO4 → Na2SO4 + 2HCl, treating the acid as a reactant and the salt as a product, but they forget that the acid is consumed and the salt is produced
The correct balanced symbol equation for preparing a soluble salt from an acid and an insoluble metal salt is: 2NaCl + H2SO4 → Na2SO4 + 2HCl. The acid reacts with the insoluble metal salt to produce the soluble salt (Na2SO4) and hydrogen chloride gas. Ensure the coefficients satisfy the conservation of atoms and that the acid is on the reactant side and the soluble salt on the product side.
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