The correct answer is: B. Highly impervious
Stoneware pipes are made of clay that has been fired at a high temperature. This makes them very strong and resistant to damage from water, chemicals, and other environmental factors. Stoneware pipes are also very smooth on the inside, which makes them very efficient at carrying water.
A. Highly resistant to sulphide corrosion: Stoneware pipes are not as resistant to sulphide corrosion as some other types of pipes, such as PVC pipes. Sulphide corrosion is a type of corrosion that is caused by the presence of sulphide ions in water. Sulphide ions can cause the metal in pipes to corrode, which can lead to leaks and other problems.
C. Hydraulically efficient because of their smooth interior surface: Stoneware pipes are very smooth on the inside, which makes them very efficient at carrying water. The smooth surface of the pipe reduces friction, which allows water to flow through the pipe more easily. This makes stoneware pipes a good choice for applications where water flow is important, such as in irrigation systems and water distribution systems.
D. Especially suited to pressure pipes: Stoneware pipes are not especially suited to pressure pipes. They are not as strong as some other types of pipes, such as steel pipes, and they are not as resistant to pressure. This means that stoneware pipes are not a good choice for applications where there is a lot of pressure, such as in water mains and gas lines.