Chemistry 2000 JAMB Past Questions - Question 39: Potassium vapour burns with a

Correct Answer

C

Explanation

Potassium vapor burns with a lilac or pale purple flame. This characteristic flame color is often used in flame tests to identify the presence of potassium ions in a sample. The specific color of the flame is due to the energy transitions of electrons in the potassium atoms as they absorb and then release energy in the form of light. Each element emits light at characteristic wavelengths, and the color of the flame can be used to identify the presence of specific elements.