A highly reactive element $X$ is stored under water. It readily reacts with the oxygen in air to give a compound $Y$ which dissolves in water. The aqueous solution of $Y$ changes a 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 which turn red litmus blue.
Sulphur is not very reactive.
So, phosphorous reacts with oxygen to form phosphorous pentoxide.
$P_{4} + 5 O_{2} \to P_{4} O_{10}$
$P_{4} O_{10} + 6 H_{2} O \to 4 H_{3} P O_{4}$
(Phosphoric acid)
$H_{3} P O_{4}$ changes blue litmus red.

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

The correct option is C PhosphorousSodium and potassium form bases which turn red litmus blue. Sulphur is not very reactive. So, phosphorous reacts with oxygen to form phosphorous pentoxide. P4+5O2→P4O10 P4O10+6H2O→4H3PO4 (Phosphoric acid) H3PO4 changes blue litmus red.

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