Why can all alkalis be called bases, but all bases cannot be called alkalis?
Answer and explanation
Correct answer: Because only soluble bases are called alkalis
The governing classification is based on solubility in water. A base is a substance that can neutralise an acid, but only a base that dissolves in water is specifically called an alkali; examples include sodium hydroxide and potassium hydroxide. Thus every alkali belongs to the wider group of bases, whereas insoluble bases such as copper(II) oxide are not alkalis. Options B, C and D contradict the definition. Hence A is correct.
Frequently asked questions
What is the correct answer to this question?
Because only soluble bases are called alkalis
Why is this the correct answer?
The governing classification is based on solubility in water. A base is a substance that can neutralise an acid, but only a base that dissolves in water is specifically called an alkali; examples include sodium hydroxide and potassium hydroxide. Thus every alkali belongs to the wider group of bases, whereas insoluble bases such as copper(II) oxide are not alkalis. Options B, C and D contradict the definition. Hence 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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