Multiple choice

Zero hardness of water is achieved by

  1. lime soda process

  2. excess lime treatment

  3. iron exchange treatment

  4. excess alum and lime treatment

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Zero hardness, other than ion exchange or base exchange or zeolite method, leaves behind a substantial amount of hardness or alkalinity. Only by means of zeolite process can zero hardness of water be achieved.