JEE Main 2015 · 10 Apr · Shift 1 · Chemistry Q43

← JEE Main 2015 · 10 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 43 of 90

Permanent hardness in water cannot be cured by :

Boiling

Ion exchange method

Calgon's method

Treatment with washing soda

Answer and worked solution

Official answer: A

Permanent hardness comes from chlorides and sulphates of Ca and Mg, which boiling does not remove. Ion exchange, Calgon and washing soda all remove it.

Topics:Water and hydrogen peroxide

← Previous question Next question →

JEE Main 2015 · 10 Apr · Shift 1, Chemistry question 43