Let's classify each compound: A. Sodium hydroxide (NaOH): NaOH is a strong base. Soluble bases are called alkalis. NaOH is highly soluble and completely dissociates in water, making it a strong alkali. Matches with 2 (Alkali). B. Calcium oxide (CaO): CaO is a metal oxide. Metal oxides are generally basic in nature. When dissolved in water, it forms calcium hydroxide (Ca(OH)₂), a base. Thus, CaO is a base (basic oxide). Matches with 4 (Base). C. Acetic acid (CH₃COOH): This is an organic acid (carboxylic acid). It is a weak acid because it does not completely dissociate in water. Matches with 3 (Weak acid). D. Hydrochloric acid (HCl): HCl is a mineral acid. It is a strong acid because it completely dissociates in water. Matches with 1 (Strong acid).
Match List I with List II and select the correct answer using the code given below the Lists : List I List II (Compound) (Nature)
Asked in UPSC NDA 1 2015 · Topic: Acid, Base and Salt (Definitions of Acids and Bases (Arrhenius and Brønsted-Lowry concepts))
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