Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will
change the colour of blue litmus to red?
(a) Sulphur dioxide
(b) Iron oxide
(c) Magnesium oxide
(d) Copper oxide
(a) Sulphur is a non-metal and it forms an acidic oxide, i.e. sulphur dioxide (S02) which turns blue litmus red.