If a salt solution turns red litmus blue, which could be a possible example?
Answer and explanation
Correct answer: Sodium carbonate
The governing concept is hydrolysis of salts and the resulting solution character. Sodium carbonate is formed from a strong base, sodium hydroxide, and a weak acid, carbonic acid. Its carbonate ions hydrolyse in water and generate hydroxide ions, so the solution is basic and can turn red litmus blue. Ammonium chloride and copper sulphate generally give acidic solutions, while sodium chloride is approximately neutral. Hence sodium carbonate, option A, is the suitable example.
Frequently asked questions
What is the correct answer to this question?
Sodium carbonate
Why is this the correct answer?
The governing concept is hydrolysis of salts and the resulting solution character. Sodium carbonate is formed from a strong base, sodium hydroxide, and a weak acid, carbonic acid. Its carbonate ions hydrolyse in water and generate hydroxide ions, so the solution is basic and can turn red litmus blue. Ammonium chloride and copper sulphate generally give acidic solutions, while sodium chloride is approximately neutral. Hence sodium carbonate, option A, is the suitable example.
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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