Samples of four different oxides were taken and dissolved in water separately to form the respective oxide solution. The four solutions were then tested for their acidic/basic nature. When dissolved in water, which of the following oxides, is likely to turn blue litmus red ?

Options

A. `SO_(2)`
B. `MgO`
C. `Fe_(2)O_(3)`
D. `CaO`

Answer

A

Explanation

Oxides of metals are basic as they form bases when dissolved in water thus, turns red litmus blue while oxides of non-metals are acidic as they form acids when dissolved in water and thus, turn blue litmus red. Thus, Mg, Fe and Ca are metals while the only non-metal is S thus, its oxide `(SO_(2))` will be acidic.