Let’s say an element “X” reacts with O2 to form a compound which has a high melting point and is water soluble. Which of the following is more likely to be the element “X”.

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Iron

Silicon

Carbon

Calcium

answer is D.

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Detailed Solution

When an element “X” reacts with O2 to form a compound which has a high melting point and is water soluble, calcium is more likely to be the element “X”.
The correct answer is more likely to be the element “calcium” as it produces calcium oxide (CaO) as a by-product of its reaction with O2, which is a water soluble compound with a high melting point.

2 Ca + O_{2} \to 2 CaO

Calcium oxide is also called quick lime. It is whitish/greyish solid. It acts as a base. On reaction with water, it forms slaked lime or calcium hydroxide Ca(OH)2

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