If one solution turns red litmus blue and another turns blue litmus red, what is likely to form when they are mixed?
Answer and explanation
Correct answer: Salt and water
Red litmus turning blue identifies the first solution as basic, while blue litmus turning red identifies the second as acidic. When an acid reacts with a base, hydrogen ions and hydroxide ions combine to form water, and the remaining ions generally form a salt. This is a neutralisation reaction, although the final mixture’s exact pH depends on the amounts used. Therefore A is correct; metal, oxygen, and sugar do not follow from this test.
Frequently asked questions
What is the correct answer to this question?
Salt and water
Why is this the correct answer?
Red litmus turning blue identifies the first solution as basic, while blue litmus turning red identifies the second as acidic. When an acid reacts with a base, hydrogen ions and hydroxide ions combine to form water, and the remaining ions generally form a salt. This is a neutralisation reaction, although the final mixture’s exact pH depends on the amounts used. Therefore A is correct; metal, oxygen, and sugar do not follow from this test.
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.
