JAMB - Chemistry (2006 - No. 9)
The characteristic colour of the flame shown when a copper salt moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is
lilac
green
yellow
brick-red
Vysvětlení
when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner, the characteristics colour of the flame is green. This is due to the presence of copper ions (Cu\(^{2+}\), which emit a green light when heated.