If a solution has pH less than 7 and releases gas with a metal carbonate, what could the solution be?
Answer and explanation
Correct answer: Acidic solution
The governing concept is the characteristic reaction of acids with carbonates. A pH below 7 indicates that the solution is acidic, meaning it has a higher hydrogen-ion concentration than a neutral solution. Acids react with metal carbonates to form a salt, water and carbon dioxide gas, causing effervescence. Therefore option A is correct; a base or neutral solution does not give this combined evidence, and solid salt is not a solution.
Frequently asked questions
What is the correct answer to this question?
Acidic solution
Why is this the correct answer?
The governing concept is the characteristic reaction of acids with carbonates. A pH below 7 indicates that the solution is acidic, meaning it has a higher hydrogen-ion concentration than a neutral solution. Acids react with metal carbonates to form a salt, water and carbon dioxide gas, causing effervescence. Therefore option A is correct; a base or neutral solution does not give this combined evidence, and solid salt is not a solution.
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.
