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JEE Main 201510 AprilOnline

Exam: JEE Main
Year: 2015
Date: 10 April
Mode: Online
Subject: Chemistry
Chapter: Hydrogen

JEE Main 2015 · 10 April · Online · Chemistry · Hydrogen

Permanent hardness in water cannot be cured by:

Permanent hardness in water cannot be cured by:

Options

ATreatment with washing soda
BIon exchange method
CCalgon's method
DBoiling

Correct answer

D. Boiling

Step-by-step solution

Permanent hardness due to

{SO}_{4}^{2 -}, C{l}^{-}

of

C{a}^{2 +}

and

M{g}^{2 +}

cannot be removed by boiling.

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