JAMB Chemistry 2010 Paper

Concept:Metal ions produce characteristic colors in a non-luminous flame, allowing identification.Explanation:A non-luminous flame is clean and hot, suitable for flame tests. Calcium ions ($\mathrm{Ca}^{2+}$) produce a brick-red or orange-red color in the flame. Sodium ions ($\mathrm{Na}^{+}$) give a yellow flame, while iron ions do not give a distinctive orange-red flame. Therefore, the compound giving an orange-red color likely contains calcium ions.Answer:B. $\mathrm{Ca}^{2+}$