Which of the following statements is true regarding caustic soda?

Caustic soda, chemically known as sodium hydroxide (NaOH), is indeed a strong alkaline compound. It plays a crucial role in various industrial processes, especially in water treatment, where it can be used to adjust pH levels. Its strong alkaline nature means that it can drastically increase the pH of a solution, making it more basic. This characteristic is essential in many applications, such as saponification, where fats or oils are converted into soap, and in the manufacture of paper, textiles, and detergents.

The other statements do not accurately reflect the properties or uses of caustic soda. While caustic soda can influence water chemistry, it does not increase oxygen levels in water, lower temperatures in a boiler, or have a neutral effect on water chemistry. Instead, it fundamentally alters the chemistry by increasing the alkalinity, highlighting the importance of understanding its reactive nature in practical applications.