Aqueous sodium carbonate turns red litmus blue. What nature does this show?
Answer and explanation
Correct answer: Basic
The governing indicator rule is that a basic solution changes red litmus to blue. Sodium carbonate dissolves in water and undergoes hydrolysis, producing a solution with alkaline character. The observation therefore identifies its aqueous solution as basic, so option B is correct. An acidic solution would turn blue litmus red, a neutral solution would show no such change, and “metallic” is not a solution nature indicated by litmus.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
The governing indicator rule is that a basic solution changes red litmus to blue. Sodium carbonate dissolves in water and undergoes hydrolysis, producing a solution with alkaline character. The observation therefore identifies its aqueous solution as basic, so option B is correct. An acidic solution would turn blue litmus red, a neutral solution would show no such change, and “metallic” is not a solution nature indicated by litmus.
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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