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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.

Related tags

Acid TestMagnesiumHydrogen GasAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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