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Question

Oxide of which of the following will turn red litmus blue?

This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is

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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