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Q13 (NDA-I/2015) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

Match List I with List II and select the correct answer using the code given below the Lists: List I (Compound) A. Sodium hydroxide B. Calcium oxide C. Acetic acid D. Hydrochloric acid List II (Nature) 1. Strong acid 2. Alkali 3. Weak acid 4. Base Code: A B C D

Result
Your answer: —  Â·  Correct: B
Explanation

The classification of the given compounds is based on their dissociation behavior in water. Sodium hydroxide (NaOH) is a strong base that dissolves completely in water, making it an alkali. Calcium oxide (CaO), also known as quicklime, is a basic oxide that reacts with water to form calcium hydroxide; it is fundamentally classified as a base [2]. Acetic acid (CH3COOH) is categorized as a weak acid because it only partially ionizes in aqueous solutions, producing fewer hydrogen ions compared to strong acids [2]. Hydrochloric acid (HCl) is a strong acid as it undergoes complete dissociation into hydrogen and chloride ions in water [2]. Matching these properties: A-2 (Alkali), B-4 (Base), C-3 (Weak acid), and D-1 (Strong acid) leads to the sequence 2, 4, 3, 1.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > 2.1.6 Reaction of a Non-metallic Oxide with Base > p. 22
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > 2.3 HOW STRONG ARE ACID OR BASE SOLUTIONS? > p. 26
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