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

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. Calcium oxide has a very high melting point of 842 °C.

${2Ca + O}_{2} \to 2 CaO$
${CaO + H}_{2} O \to {Ca(OH)}_{2}$

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

The correct option is A CalciumCalcium reacts with oxygen to form calcium oxide, which reacts with water to form calcium hydroxide, which is an alkali. Calcium oxide has a very high melting point of 842 °C. 2Ca + O2→2CaO CaO + H2O→Ca(OH)2

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. Calcium oxide has a very high melting point of 842 °C.

${2Ca + O}_{2} \to 2 CaO$
${CaO + H}_{2} O \to {Ca(OH)}_{2}$