Question

Permutit has an exchange value of ________ grams of hardness per m^3 of zeolite.

(a) 10,000

(b) 20,000-30,000

(c) 35,000-40,000

(d) 40,000-50,000

The question was asked in an internship interview.

This key question is from Zeolite Process topic in portion Water Softening of Environmental Engineering

Answer 1

Correct choice is (c) 35,000-40,000

To explain I would say: Permutit has an exchange value of 35,000-40,000 grams of hardness per m^3 of zeolite. They absorb moisture from the atmosphere and should be kept in a dry place.