In which pair is the first substance acidic and the second substance basic?
Answer and explanation
Correct answer: Lemon juice and soap solution
Lemon juice contains citric acid, so it is acidic. Soap solution is generally alkaline because soap reacts with water to produce a basic solution. Thus the pair in option A has an acidic first substance and a basic second substance. In option B the order is reversed, option C contains neutral water followed by an acid, and option D contains two commonly basic substances rather than the requested acid–base order.
Frequently asked questions
What is the correct answer to this question?
Lemon juice and soap solution
Why is this the correct answer?
Lemon juice contains citric acid, so it is acidic. Soap solution is generally alkaline because soap reacts with water to produce a basic solution. Thus the pair in option A has an acidic first substance and a basic second substance. In option B the order is reversed, option C contains neutral water followed by an acid, and option D contains two commonly basic substances rather than the requested acid–base order.
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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