The aqueous solution of a non-metal oxide turns blue litmus red. What is the nature of the non-metal oxide?
Answer and explanation
Correct answer: Acidic
The governing indicator principle is that an acidic solution changes blue litmus to red. Many non-metal oxides, such as carbon dioxide and sulphur dioxide, dissolve or react with water to form acidic solutions. Therefore the oxide described is acidic, so option B is correct. Option A would be supported by a red-to-blue change, whereas metallic and neutral-solid descriptions do not explain the observed litmus result. The test concerns the solution formed in water.
Frequently asked questions
What is the correct answer to this question?
Acidic
Why is this the correct answer?
The governing indicator principle is that an acidic solution changes blue litmus to red. Many non-metal oxides, such as carbon dioxide and sulphur dioxide, dissolve or react with water to form acidic solutions. Therefore the oxide described is acidic, so option B is correct. Option A would be supported by a red-to-blue change, whereas metallic and neutral-solid descriptions do not explain the observed litmus result. The test concerns the solution formed in water.
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.
