alleryStart learning →An element reacts with oxygen to give an oxide with a high melting point that is also soluble in water. The element is most likely
Acalcium
Bcarbon
Csilicon
Diron
Answer & Solution
Correct answer: A. calcium
1. A high-melting oxide that dissolves in water to give an alkali points to a reactive metal.
2. **Calcium** forms CaO (very high melting point) which dissolves in water to give Ca(OH)₂, an alkali.
3. Carbon and silicon give acidic/covalent oxides; iron oxide is not water-soluble.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', Exercise Q.3_
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