The elements whose oxides can turn litmus solution blue are:

carbon and sulphur

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sodium and carbon

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potassium and magnesium

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magnesium and sulphur

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Solution

The correct option is C potassium and magnesium
LITMUS TEST
Bases-turn red litmus to blue.
Potassium and magnesium oxides are basic in nature.
Acids-turn blue litmus red.
Sulphur carbon oxides are acidic.
Oxides of groups I and II are basic in nature. Hence, they turn litmus blue. Examples are Na, K, Mg, Ca etc.

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