AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) An alkali
A base that is soluble in water is called an alkali. For example, NaOH and KOH dissolve in water and are alkalis.
Source: Chapter 2, Section 2.2
The textbook explicitly states: "Bases which are soluble in water are called alkalis." Examiners expect students to recall this precise definition. Do not confuse base (broader term) with alkali (only water-soluble bases).