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:
A
Calcium
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B
Carbon
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C
Silicon
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D
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.