Question

A lilac-coloured flame is produced on heating.

• A. Potassium in a flame
• B. Cobalt in a flame
• C. Sodium in a flame
• D. Methane in oxygen

Answer 1

The correct option is A Potassium in a flame

Potassium on heating produced lilac-colured flame because on heating, an atom entities its electrons and they jump to higher energy levels. When the electron return to lower energy levels, they emit energy in the form of light. The colour produced on heating depends upon wavelength of emitted light.