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?

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

Calcium

Silicon

Carbon

Iron

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is calcium.
Oxygen and calcium react to form calcium oxide. Calcium oxide's chemical formula is CaO. It has a very high melting point.

The melting point of CaO is 4,662°F (2,572°C). The calcium cation $C a^{+ 2}$ and the oxygen anion $O^{2 -}$ form an ionic bond. Calcium hydroxide is produced when calcium oxide is dissolved in water.
$CaO + H_{2} O \to Ca (OH)_{2}$
Iron oxide (Ferric oxide) is insoluble in water. Silicon dioxide has also a high melting point but less than CaO.