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

List-I (Common Name)	List-II (Chemical Name)
A. Bleaching powder	1. Sodium hydrogen carbonate
B. Baking soda	2. Sodium carbonate
C. Washing soda	3. Calcium hydroxide
D. Slaked lime	4. Calcium oxychloride

Code:

(a) A-4, B-1, C-2, D-3
(b) A-4, B-2, C-1, D-3
(c) A-3, B-2, C-1, D-4
(d) A-3, B-1, C-2, D-4

The correct answer is Option (a). This matching is based on the chemical nomenclature and industrial applications of calcium and sodium compounds.

• A-4 (Bleaching Powder - Calcium oxychloride): Also known as chloride of lime (CaOCl₂), it is produced by the action of chlorine on dry slaked lime and is used widely as a disinfectant and bleaching agent.
• B-1 (Baking Soda - Sodium hydrogen carbonate): NaHCO₃ is a mild non-corrosive basic salt. It is essential in the food industry for leavening and acts as an antacid.
• C-2 (Washing Soda - Sodium carbonate): Na₂CO₃·10H₂O is used in glass, soap, and paper industries, and for removing the permanent hardness of water.
• D-3 (Slaked Lime - Calcium hydroxide): Ca(OH)₂ is formed by the reaction of quicklime with water. It is used in whitewashing, sewage treatment, and neutralizing acidic soil.

Options (b), (c), and (d) are incorrect because they mismatch these specific chemical identities and their corresponding common names.