A substance forms salt and water with an acid but does not dissolve in water. What is it more correctly called?
Answer and explanation
Correct answer: Base
The governing distinction is between a base and an alkali. A base is a substance that reacts with an acid to form salt and water; it may be soluble or insoluble in water. An alkali is specifically a base that dissolves in water and produces hydroxide ions in solution. Since the substance does not dissolve in water, it should be called a base, not an alkali. An acid or indicator does not fit the described reaction, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Base
Why is this the correct answer?
The governing distinction is between a base and an alkali. A base is a substance that reacts with an acid to form salt and water; it may be soluble or insoluble in water. An alkali is specifically a base that dissolves in water and produces hydroxide ions in solution. Since the substance does not dissolve in water, it should be called a base, not an alkali. An acid or indicator does not fit the described reaction, so option A is correct.
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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