A gas turns moist blue litmus red. What does this indicate about the gas?
Answer and explanation
Correct answer: The gas dissolves in water to form an acidic solution
Moisture is essential because the gas must dissolve in the thin water layer before acidic ions can affect the indicator. Turning blue litmus red shows that the resulting aqueous solution is acidic. This observation does not identify one particular gas and does not imply hydrogen; nor does it indicate a base. Therefore option A correctly describes the evidence without making an unjustified identification.
Frequently asked questions
What is the correct answer to this question?
The gas dissolves in water to form an acidic solution
Why is this the correct answer?
Moisture is essential because the gas must dissolve in the thin water layer before acidic ions can affect the indicator. Turning blue litmus red shows that the resulting aqueous solution is acidic. This observation does not identify one particular gas and does not imply hydrogen; nor does it indicate a base. Therefore option A correctly describes the evidence without making an unjustified identification.
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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