The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur

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Solution

(c) potassium and magnesium
Potassium and magnesium are metals whose oxides are basic in nature. These oxides turn red litmus solution to blue.

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The element whose oxide will turn red litmus solution to blue will be:

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The element Z burns in air to form an oxide.The aqueous solution of this oxide turns blue litmus to red.

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