Oxide of which of the following will turn red litmus blue?
Magnesium
Red litmus turns blue in the presence of a base. Metallic oxides are generally basic, while non-metallic oxides are acidic.
Magnesium is a metal; its oxide MgO reacts with water to form Mg(OH)2, a base that turns red litmus blue. Oxides of phosphorus (P2O5), sulphur (SO2/SO3) and carbon (CO2) are acidic and turn blue litmus red, so they fail this test. Hence the answer is Magnesium.
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