Question detail
For Aqueous ion tests (A-level only), which answer correctly classifies silver nitrate and barium chloride tests for ALC-de6f1135?
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 ions in aqueous solution (A-level only)
Question
- A. Silver nitrate and barium chloride are used for anion tests, not cation tests. ALC-de6f1135
- B. Silver nitrate and barium chloride are routine cation tests. ALC-de6f1135
- C. Both tests identify transition-metal complex colours. ALC-de6f1135
- D. Both tests are flame tests for metal ions. ALC-de6f1135
Answer
Silver nitrate and barium chloride are used for anion tests, not cation tests. ALC-de6f1135
Explanation
The correct option is Silver nitrate and barium chloride are used for anion tests, not cation tests. ALC-de6f1135. Silver nitrate is used to test halide anions and barium chloride is used to test sulfate ions. This keeps anion testing separate from cation testing for Required practical: carry out test-tube reactions to identify cations and anions..
Common mistake
Identifying Cations with Sodium Hydroxide
Students often incorrectly assume that all metal ions will produce a precipitate when reacted with sodium hydroxide.
To correctly identify cations, remember that only certain metal ions form insoluble hydroxides. For example, when testing with sodium hydroxide, use the formula for the reaction: Metal Ion + NaOH → Metal Hydroxide (precipitate). For instance, Fe²⁺ + 2NaOH → Fe(OH)₂ (s) shows a green precipitate, while Na⁺ does not produce any precipitate. Always check the solubility rules for hydroxides.
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