Question

Calgon conditioning is not applicable for the prevention of ___________

(a) Iron oxide only

(b) Copper depositions only

(c) Sulphurdioxide only

(d) Iron oxide and copper depositions

This question was posed to me in a job interview.

Origin of the question is Calgon Conditioning topic in division Water and its Treatment of Engineering Chemistry II

Answer 1

Right option is (d) Iron oxide and copper depositions

Explanation: Calgon conditioning is not applicable to the prevention of iron oxide and copper depositions. Calgon prevents limescale build-up in washing machines all over the world to protect the heating element, pipes and drum of the machines.