A colourless solution conducts electricity, but the dry substance does not affect litmus. What condition is necessary for acidic behaviour?
Answer and explanation
Correct answer: The presence of water
Acidic behaviour in the school-level aqueous model depends on the formation and movement of ions, especially H₃O⁺. Many substances that are acids do not release mobile hydrogen-containing ions in the dry state, so dry hydrogen chloride, for example, does not change dry litmus. In water, ionisation occurs and the solution conducts electricity and shows acidic properties. Thus option A is necessary; darkness, low temperature, or a metal container is not the governing condition.
Frequently asked questions
What is the correct answer to this question?
The presence of water
Why is this the correct answer?
Acidic behaviour in the school-level aqueous model depends on the formation and movement of ions, especially H₃O⁺. Many substances that are acids do not release mobile hydrogen-containing ions in the dry state, so dry hydrogen chloride, for example, does not change dry litmus. In water, ionisation occurs and the solution conducts electricity and shows acidic properties. Thus option A is necessary; darkness, low temperature, or a metal container is not the governing condition.
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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