Why does dry hydrogen chloride gas show no effect on dry blue litmus?
Answer and explanation
Correct answer: Ions do not form without water (जल के बिना आयन नहीं बनते)
The governing concept is that HCl shows acidic behaviour in the presence of water. Dry hydrogen chloride molecules do not produce hydrogen or hydronium ions on dry litmus paper because water is absent. Without those ions, the acid–base indicator cannot undergo its characteristic colour change, so option A is correct. HCl is not basic; the composition of litmus and the colour of the gas do not explain the absence of the reaction.
Frequently asked questions
What is the correct answer to this question?
Ions do not form without water (जल के बिना आयन नहीं बनते)
Why is this the correct answer?
The governing concept is that HCl shows acidic behaviour in the presence of water. Dry hydrogen chloride molecules do not produce hydrogen or hydronium ions on dry litmus paper because water is absent. Without those ions, the acid–base indicator cannot undergo its characteristic colour change, so option A is correct. HCl is not basic; the composition of litmus and the colour of the gas do not explain the absence of the reaction.
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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