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Alkali Metals

Question 3An ...

Question

Question 3

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

a) Calcium
b) Carbon
c) Silicon
d) Iron

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Solution

The element is most likely to be calcium. It reacts with oxygen to form calcium oxide that dissolves in water to form calcium hydroxide. The melting point of calcium oxide is nearly $2500^{0} C$ .

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