Question detail
In Required practical: identifying ions, which answer best matches the evidence for metal ion test?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Identification of ions by chemical and spectroscopic means
Question
- A. Iron(II)
- B. Iron(III)
- C. Copper(II)
- D. Aluminium
Answer
The correct answer is Iron(II). It matches metal ion test because the evidence is precipitate observation and the expected result is cation identity.
Explanation
The correct option is Iron(II). This is correct because precipitate observation is the evidence expected for metal ion test, and cation identity is the result that supports the conclusion. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Confusing Precipitate Colors
Students often confuse the colors of precipitates formed by different metal ions when using sodium hydroxide solution.
To fix this, students should memorize the specific colors of precipitates for each metal ion, such as white for aluminum, calcium, and magnesium, and blue for copper(II).
Related flashcards
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