Question detail
What is observed when aqueous zinc ions react with sodium hydroxide (A-level cue d935b1a2 focus)
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. A white precipitate forms that dissolves in excess NaOH
- B. A blue precipitate forms (A-level cue d935b1a2 distractor 1)
- C. A green precipitate forms (A-level cue d935b1a2 distractor 2)
- D. No precipitate forms (A-level cue d935b1a2 distractor 3)
Answer
A white precipitate forms that dissolves in excess NaOH
Explanation
The correct option is A white precipitate forms that dissolves in excess NaOH. A white precipitate forms that dissolves in excess NaOH is correct because it supports the objective: Describe reactions of aqueous metal ions with sodium hydroxide.. The reasoning stays within Aqueous ion tests (A-level only) and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Aqueous ion tests (A-level only). Retrieval anchor: A-level cue d935b1a2.
Common mistake
Misidentifying Precipitate Colors
Students often incorrectly describe the color of the precipitate formed when aqueous metal ions react with sodium hydroxide, confusing different metal ions.
To accurately describe the color of the precipitate, remember the specific reactions: for example, when copper(II) ions react with sodium hydroxide, the formula is Cu²⁺ + 2OH⁻ → Cu(OH)₂ (s), which forms a blue precipitate. Always refer to the specific metal ion and its corresponding hydroxide color.
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