Question

The permanent hardness can be removed by adding lime and soda.

(a) True

(b) False

I have been asked this question by my college director while I was bunking the class.

My query is from Lime Soda Process topic in portion Water Softening of Environmental Engineering

Answer 1

The correct option is (a) True

To elaborate: The permanent hardness can be removed by adding  Ca (OH)2 as lime and sodium carbonate as soda in water and the process is called lime soda process.