A highly reactive substance X is stored safely under water. It readily reacts with oxygen to give a compound Y which dissolves in water. The aqueous solution of Y changes blue litmus solution to red. Identify X and Y.

X: Carbon
Y: Carbon dioxide

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X: Sodium,
Y: Sodium oxide

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X: Phosphorus,
Y: Phosphorus pentoxide

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X: Potassium,
Y: Potassium oxide

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Solution

The correct option is A X: Carbon
Y: Carbon dioxide

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