An unknown solution turns blue indicator paper red and gives a gas with magnesium. What is the nature of the solution?
Answer and explanation
Correct answer: Acidic
Turning blue indicator paper red is a direct indication that the solution is acidic. The second observation supports this conclusion because magnesium reacts with an acid to form a salt and release hydrogen gas, for example Mg + 2HCl → MgCl₂ + H₂. A basic or neutral solution would not produce this combined pattern, and being salty alone does not determine acidity.
Frequently asked questions
What is the correct answer to this question?
Acidic
Why is this the correct answer?
Turning blue indicator paper red is a direct indication that the solution is acidic. The second observation supports this conclusion because magnesium reacts with an acid to form a salt and release hydrogen gas, for example Mg + 2HCl → MgCl₂ + H₂. A basic or neutral solution would not produce this combined pattern, and being salty alone does not determine acidity.
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.
