A salt solution turns red litmus blue. It is more likely formed from which combination?
Answer and explanation
Correct answer: Weak acid and strong base
Red litmus turning blue shows that the salt solution is basic. A salt formed from a weak acid and a strong base usually gives a basic solution because the anion of the weak acid reacts with water and generates hydroxide ions. Thus option A is correct. A strong-acid/weak-base salt is generally acidic, while a strong-acid/strong-base salt is approximately neutral; water and a metal do not describe a normal salt-forming combination here.
Frequently asked questions
What is the correct answer to this question?
Weak acid and strong base
Why is this the correct answer?
Red litmus turning blue shows that the salt solution is basic. A salt formed from a weak acid and a strong base usually gives a basic solution because the anion of the weak acid reacts with water and generates hydroxide ions. Thus option A is correct. A strong-acid/weak-base salt is generally acidic, while a strong-acid/strong-base salt is approximately neutral; water and a metal do not describe a normal salt-forming combination here.
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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