Q. 34.0( 66 Votes )

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

Answer :

The element is likely to be calcium. When calcium reacts with oxygen to give an ionic compound, calcium oxide, having a high melting point. This calcium oxide compound is soluble in water. When carbon reacts with oxygen, carbon dioxide is formed which is a gas. Silicon reacts with oxygen to form a compound silicon dioxide which has high melting point but insoluble in water. Similarly, iron reacts with oxygen to form iron (III) oxide compound which has a high melting point but ' insoluble in water

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