Universal indicator is added to an aqueous solution of oxide $X$. The indicator undergoes a colour change from green to red. What is $X$?
- A$\text{MgO}$
- B$\text{CaO}$
- C$\text{K}_2\text{O}$
- D$\text{NO}_2$
Chemistry 0620 · IGCSE · Oxides
Chemistry 0620 · IGCSE · Oxides
Universal indicator is added to an aqueous solution of oxide $X$. The indicator undergoes a colour change from green to red. What is $X$?