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Q104 (CAPF/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

Match List-I with List-II and select the answer using the code given below the Lists: List-I (Reaction) : List-II (Type of Reaction) A. : 1. Combustion B. : 2. Double displacement C. : 3. Displacement D. : 4. Neutralization

Result
Your answer: —  Â·  Correct: B
Explanation

The reactions are classified based on the exchange of atoms and the nature of reactants. Reaction A involves a substance reacting with oxygen to release energy, which is a combustion reaction [1]. Reaction B involves an acid (HCl) reacting with a base (NaOH) to produce salt (NaCl) and water (H2O), defined as a neutralization reaction. Reaction C is a displacement reaction where a more reactive element (Fe) displaces a less reactive element (Cu) from its compound [2]. Reaction D is a double displacement (metathesis) reaction where ions from two compounds, BaCl2 and Na2SO4, exchange places to form two new compounds, BaSO4 and NaCl [1]. Matching these gives: A-1 (Combustion), B-4 (Neutralization), C-3 (Displacement), and D-2 (Double displacement), which corresponds to Option 2.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 1: Chemical Reactions and Equations > What you have learnt > p. 14
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > 2.1.4 How do Acids and Bases React with each other? > p. 21
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