Option 1 states that bleaching powder is used as a reducing agent in chemical industries. A reducing agent is a substance that donates electrons to another substance during a chemical reaction, thereby causing a reduction in the oxidation state of that substance. However, bleaching powder is not typically used as a reducing agent in chemical industries. Instead, it is primarily used for its bleaching and disinfecting properties.

Option 2 states that bleaching powder is used for bleaching wood pulp in paper factories. This is true. Bleaching powder is commonly used in the paper industry to remove impurities and lighten the color of wood pulp, resulting in white paper.

Option 3 states that bleaching powder is used for disinfecting drinking water. This is also true. Bleaching powder is a powerful disinfectant and is often added to drinking water to kill bacteria and other harmful microorganisms.

Option 4 states that bleaching powder is used for bleaching linen in the textile industry. This is true as well. Linen is a natural fabric that can be bleached using bleaching powder to remove stains and achieve a brighter, whiter appearance.

In conclusion, the statement that is NOT true for bleaching powder is option 1, which suggests it is used as a reducing