By signing in you confirm you are 18 or older, or have your parent’s or guardian’s consent.

NDA 2 2025 GAT, question 107

Topic: Chemistry

Q107

Match List I with List II and select the answer using the code given below the Lists :

List I (Reaction) List II (Type)
A. CaO (s)+H2O (l)→Ca(OH)2 (aq)CaO\,(s)+H_{2}O\,(l)\to Ca(OH)_{2}\,(aq) 1. Single displacement
B. CaCO3 (s)→CaO (s)+CO2 (g)CaCO_{3}\,(s)\to CaO\,(s)+CO_{2}\,(g) 2. Double displacement
C. Pb (s)+CuCl2 (aq)→PbCl2 (aq)+Cu (s)Pb\,(s)+CuCl_{2}\,(aq)\to PbCl_{2}\,(aq)+Cu\,(s) 3. Combination
D. Na2SO4 (aq)+BaCl2 (aq)→BaSO4 (s)+2NaCl (aq)Na_{2}SO_{4}\,(aq)+BaCl_{2}\,(aq)\to BaSO_{4}\,(s)+2NaCl\,(aq) 4. Decomposition

Code :

A B C D

  1. (a) 2 1 4 3
  2. (b) 2 4 1 3
  3. (c) 3 4 1 2Correct answer
  4. (d) 3 1 4 2

Solution.

Answer: (c) 3 4 1 2

  1. A joins reactants into one product: combination (3).
  2. B breaks one compound into simpler substances: decomposition (4).
  3. C has lead displacing copper: single displacement (1).
  4. D exchanges ions and precipitates BaSO₄: double displacement (2).
  5. The code is 3–4–1–2.