What term is used to describe an oxide whose aqueous solution turns blue litmus red?
An oxide that turns blue litmus red is acidic in nature. The term acid anhydride specifically refers to non-metal oxides that react with water to form an acidic solution. For example, sulphur trioxide (
SO\(_3\)) is the acid anhydride of sulphuric acid (H\(_2\)SO\(_4\)).
When these oxides dissolve in water, they produce hydrogen ions (H+) or hydronium ions (H\(_3\)O\(^+\)), which are responsible for changing the colour of blue litmus paper to red.
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