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NDA 1 2025 GAT, question 81

Topic: Chemistry

Q81

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

List I (Chemical Name)

A. Washing soda

B. Baking soda

C. Bleaching powder

D. Gypsum

List II (Chemical Formula)

  1. CaOCl2CaOCl_{2}

  2. NaHCO3NaHCO_{3}

  3. Na2CO3⋅10H2ONa_{2}CO_{3} \cdot 10H_{2}O

  4. CaSO4⋅2H2OCaSO_{4} \cdot 2H_{2}O

Code (A B C D):

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

Solution.

Answer: (d) 3 2 1 4

  1. Washing soda is sodium carbonate decahydrate (3); baking soda is sodium hydrogen carbonate (2); bleaching powder is represented in school chemistry as CaOCl2CaOCl_{2} (1); gypsum is calcium sulphate dihydrate (4).
  2. Thus A–3, B–2, C–1, D–4.