Element X reacts readily with the oxygen of the 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 :

Potassium

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Sodium

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Phosphorous

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Sulphur

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Solution

The correct option is C Phosphorous
Sodium and potassium form basic oxides and hence they would turn red litmus blue.
Sulphur is not very reactive. It requires constant burning to form its oxides.

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 changes blue litmus red.

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