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BITSAT 2015
Exam
BITSAT
Year
2015
Subject
Chemistry
Chapter
Hydrogen

BITSAT 2015 · Chemistry · Hydrogen

Which one the following removes temporary hardness of water?

Which one the following removes temporary hardness of water?

Options

  1. ASlaked lime
  2. B\quad Plaster of Paris
  3. CEpsom
  4. DHydrolith

Correct answer

A. Slaked lime

Step-by-step solution

This method is known as Clark's process. In this method temporary hardness is removed byadding lime water or milk of lime. Ca(OH)2+Ca(HCO3)2⟶2CaCO3ppt.↓+2H2O\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2} \longrightarrow \underset{\mathrm{ppt}.}{2 \mathrm{CaCO}_{3}} \downarrow+2 \mathrm{H}_{2} \mathrm{O}
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