Which of the following is not correct with respect to installing the drainage system in the waterlogged land?

What is the chemical used to prevent H2S gas formation from Sodium hydroxide?

What is the diameter of flush pipe?

What is the power of diminishment of van der Waals force with respect to distance?

What is the preferred size of water closet pan?

H2S gas is ___ to generate sulphuric acid.

________ should not be placed near water body.

_________ is the removal of excess surface water from the land to enhance crop growth.