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NDA General Ability General Science 2025 NDA 2025 (Phase 1)

NDA General Ability Question (2025) — Solution

Question

Match List I with List II and select the answer using the code given below the Lists: List I (Chemical Name) List II (Chemical Formula) A. Washing soda 1. CaOCl_2 B. Baking soda 2. NaHCO_3 C. Bleaching powder 3. Na_2CO_3 10H_2O D. Gypsum 4. CaSO_4 2H_2O

Options

  1. A. A-4, B-2, C-1, D-3
  2. B. A-4, B-1, C-2, D-3
  3. C. A-3, B-1, C-2, D-4
  4. D. A-3, B-2, C-1, D-4

Answer

D. A-3, B-2, C-1, D-4

Step-by-step solution

Washing soda is chemically sodium carbonate decahydrate, having the formula Na_2CO_3 10H_2O. Baking soda is chemically sodium bicarbonate, having the formula NaHCO_3. Bleaching powder is chemically calcium oxychloride, having the formula CaOCl_2. Gypsum is chemically calcium sulphate dihydrate, having the formula CaSO_4 2H_2O. The correct matching is A-3, B-2, C-1, D-4. Answer: A-3, B-2, C-1, D-4

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