Consider the following information: Substance | Chemical Formula | Use 1. Bleaching Powder | CaO2Cl2 | Making drinking water free of germs 2. Baking Soda | NaHCO3 | Soda-acid fire extinguisher 3. Washing Soda | Na2CO3 | Removing permanent hardness of water In how many of the above rows is the given information correctly matched?

Bleaching powder

• Bleaching powder is calcium oxychloride and its chemical formula is CaOCl2. It is produced by the action of chlorine on dry slaked lime. The formula given in the table is incorrect. Hence, row 1 is not correctly matched.
• It is used for bleaching cotton and linen in the textile industry, for bleaching wood pulp in the paper industry, as an oxidising agent and for disinfecting drinking water.

Baking soda

• Sodium hydrogencarbonate, NaHCO3, is used in soda-acid fire extinguishers, as an antacid, as baking powder along with a mild edible acid and as an ingredient in soda water. Hence, row 2 is correctly matched.

Washing soda

• Washing soda is sodium carbonate decahydrate and its formula is Na2CO3.10H2O, obtained by the recrystallisation of sodium carbonate. The formula given in the table is that of the anhydrous salt. Hence, row 3 is not correctly matched.
• Washing soda is used in the glass, soap and paper industries, in the manufacture of borax and for removing the permanent hardness of water.
• Therefore, only one row is correctly matched.