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

Sodium

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Sulphur

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Phosphorous

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Potassium

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Solution

The correct option is C Phosphorous
Sodium and potassium form bases on dissolving in water which turns red litmus blue. Phosphorus on exposure to air react vigorously with $O_{2}$ of air to form $P_{4} O_{10}$ .

$P_{4} + 5 O_{2} \to P_{4} O_{10}$

Phosphorus pentaoxide reacts with water to form acid $(H_{3} P O_{4})$ which turns blue litmus solution red.

$P_{4} O_{10} + 6 H_{2} O \to \begin{matrix} 4 H_{3} P O_{4} (P h o s p h o r i c a c i d) \end{matrix}$

Option C is correct.

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