A substance dissolves in water to produce hydroxide ions and feels soapy to touch. Which class does it belong to?
Answer and explanation
Correct answer: Base
According to the Arrhenius concept, a base is a substance that produces hydroxide ions, OH⁻, in aqueous solution. Many soluble bases also feel slippery or soapy because they react with oils on the skin; however, unknown substances should never be tested by touch. Acids produce H⁺ ions, a neutral salt is not necessarily hydroxide-producing, and a metal is a broader element class. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Base
Why is this the correct answer?
According to the Arrhenius concept, a base is a substance that produces hydroxide ions, OH⁻, in aqueous solution. Many soluble bases also feel slippery or soapy because they react with oils on the skin; however, unknown substances should never be tested by touch. Acids produce H⁺ ions, a neutral salt is not necessarily hydroxide-producing, and a metal is a broader element class. Therefore 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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