If a substance turns blue litmus red and forms salt and water with another substance, what is the nature of the second substance?
Answer and explanation
Correct answer: Basic
Turning blue litmus red identifies the first substance as an acid. The characteristic neutralisation reaction is acid + base → salt + water. Since the first substance is already identified as an acid and the products are salt and water, the other reacting substance must be a base, or alkaline substance. Therefore option A is correct. Another acid would not normally give this neutralisation pattern, while a neutral gas or an unreactive metal does not fit the stated evidence.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
Turning blue litmus red identifies the first substance as an acid. The characteristic neutralisation reaction is acid + base → salt + water. Since the first substance is already identified as an acid and the products are salt and water, the other reacting substance must be a base, or alkaline substance. Therefore option A is correct. Another acid would not normally give this neutralisation pattern, while a neutral gas or an unreactive metal does not fit the stated evidence.
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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