The element X, a metal reacts with oxygen to form a compound which possess high melting point. This compound is also soluble in water. X is identified to be:

Calcium

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Carbon

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Silicon

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Sulphur

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Solution

The correct option is A Calcium
Calcium reacts with oxygen to form calcium oxide, which reacts with water to form calcium hydroxide, which is an alkali.
${2Ca(s) + O}_{2} (g) \to 2 CaO (s)$
${CaO(s) + H}_{2} O (l) \to {Ca(OH)}_{2} (a q)$

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