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 to red.The element X is a) Na b) S c) P d) K

It is phosphorous. 

Sodium and potassium form bases which turns red litmus blue


 Sulphur is not very reactive. 

 So, phosphorous reacts with oxygen to form phosphorous pentoxide which changes blue litmus red.
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  • the answer is phophorus.

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hosphorous is the answer
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