Question

Which one of S, P, Ca, Si would yield a basic oxide?

Answer 1

1. When metals react with oxygen, they form metal oxides. Metal oxides are basic in nature. Some metal oxides react with water to form alkalis. Metal oxides being basic turns red litmus blue.
2. Calcium (Ca) is the only one that yields a basic oxide because Calcium (Ca) is metal. In contrast, Sulphur (S), Phosphorous (P), and Silicon (Si) are nonmetals. Nonmetals react with oxygen to form acidic or neutral oxides.
3. Hence, Calcium (Ca) yields a basic oxide.