Identifying Metal Ions Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which metal ion gives a lilac flame?
- A. Sodium
- B. Potassium
- C. Lithium
- D. Calcium
2. What technique identifies metal ions by the colour they give a Bunsen flame?
- A. Chromatography
- B. Flame test
- C. Titration
- D. Electrolysis
3. Why is the nichrome wire loop cleaned with dilute hydrochloric acid before use?
- A. To make the flame hotter
- B. To remove contaminating ions that could give a false colour
- C. To dissolve the metal ion sample
- D. To make the wire glow
4. Which colour flame indicates the presence of barium ions?
- A. Red
- B. Yellow
- C. Green
- D. Crimson
5. A student tests an unknown white solid and observes a strong yellow flame, even after repeating with fresh wire. Which conclusion is best supported?
- A. The solid definitely contains only potassium
- B. The solid contains sodium, possibly with other ions masked
- C. The solid contains no metal ions
- D. The test has failed and gives no information