In an experiment an acidic gas does not affect dry litmus. What is the exam-based reason?
Answer and explanation
Correct answer: There is no water on dry litmus to form ions
Acidic behaviour in this test requires the gas to dissolve in water and ionise, producing hydrogen ions or hydronium ions that interact with the indicator. Dry litmus provides no water film, so the necessary ions are not formed at the indicator surface and no colour change is observed. Therefore A is correct; the gas still has chemical properties.
Frequently asked questions
What is the correct answer to this question?
There is no water on dry litmus to form ions
Why is this the correct answer?
Acidic behaviour in this test requires the gas to dissolve in water and ionise, producing hydrogen ions or hydronium ions that interact with the indicator. Dry litmus provides no water film, so the necessary ions are not formed at the indicator surface and no colour change is observed. Therefore A is correct; the gas still has chemical properties.
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.
