Question

A metal which burns in air with a golden flame?

Answer 1

1. Generally, metals ($M$) react with air and form metal oxides ($MO$).
2. But, Sodium ($Na$) and potassium $\left(\mathrm{K}\right)$ the highly reactive metal that burns in the air with a golden flame.
3. Therefore, highly reactive metals like Sodium ($Na$) and Potassium ($K$) are going to be stored under kerosene to avoid a reaction with air.