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(B) $1$. Carbon forms $CO_2$,which is a gas at room temperature and has a low melting point.$2$. Calcium reacts with oxygen to form $CaO$ (calcium oxi

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Calcium

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(B) $1$. Carbon forms $CO_2$,which is a gas at room temperature and has a low melting point.$2$. Calcium reacts with oxygen to form $CaO$ (calcium oxide),which is an ionic compound with a very high melting point. $CaO$ is soluble in water,forming calcium hydroxide $(Ca(OH)_2)$.$3$. Silicon forms $SiO_2$,which is a covalent network solid with a high melting point but is insoluble in water.$4$. Iron forms $Fe_2O_3$,which has a high melting point but is insoluble in water.$5$. Therefore,the element is Calcium.

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:

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