A metal X reacts with oxygen to form a compound which possesses a 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.
$2 C a + O_{2} \to 2 C a O$
$C a O + H_{2} O \to C a (O H)_{2}$

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A metal X reacts with oxygen to form a compound which possesses a 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. 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.
$2 C a + O_{2} \to 2 C a O$
$C a O + H_{2} O \to C a (O H)_{2}$