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JAMB Chemistry 2005 Question 48

Question 48

Qualitative Analysis

In a flame test for calcium, the flame appears

  1. A.green when viewed through a blue glass
  2. B.blue when viewed through a blue glass
  3. C.orange-red when viewed through a blue glass
  4. D.brick-red when viewed through a blue glass
Show the answer and explanation

Answer: A (green when viewed through a blue glass)

Explanation

Calcium colours a flame brick-red. Blue cobalt glass absorbs much of the red-orange light, so the calcium flame looks (light) green through it.