Which pair has the first substance as an acidic oxide and the second as a basic oxide?
Answer and explanation
Correct answer: Carbon dioxide and calcium oxide
Carbon dioxide is a non-metal oxide and reacts with water to form carbonic acid, so it is acidic. Calcium oxide is a metal oxide and reacts with water to form calcium hydroxide, a base, so it is basic. Option B reverses the required order. Sodium oxide and magnesium oxide are basic metal oxides, while sulfur dioxide and carbon dioxide are both acidic non-metal oxides. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide and calcium oxide
Why is this the correct answer?
Carbon dioxide is a non-metal oxide and reacts with water to form carbonic acid, so it is acidic. Calcium oxide is a metal oxide and reacts with water to form calcium hydroxide, a base, so it is basic. Option B reverses the required order. Sodium oxide and magnesium oxide are basic metal oxides, while sulfur dioxide and carbon dioxide are both acidic non-metal oxides. Therefore A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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