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JEE Main 202228 JulyMorning Shift

Exam: JEE Main
Year: 2022
Date: 28 July
Shift: Morning Shift
Subject: Chemistry
Chapter: Hydrogen

JEE Main 2022 · 28 July · Morning Shift · Chemistry · Hydrogen

The metal salts formed during softening of hardwater using Clark's...

The metal salts formed during softening of hardwater using Clark's method are

Options

A $Ca{\left(OH\right)}_{2}$ and $Mg{\left(OH\right)}_{2}$
B{CaCO}_{3} $and$ Mg{ $\left(OH\right)}_{2}$
CCa{ $\left(OH\right)}_{2}$ and ${MgCO}_{3}$
D ${CaCO}_{3}$ and ${MgCO}_{3}$

Correct answer

B. {CaCO}_{3} $and$ Mg{ $\left(OH\right)}_{2}$

Step-by-step solution

Clark's method: In this method calculated amount of lime is added to hard water. It precipitates out calcium carbonate and magnesium hydroxide which can be filtered off.
Clark's Method Reaction
$Ca{\left({HCO}_{3}\right)}_{2} + Ca{\left(OH\right)}_{2} \to 2{CaCO}_{3} + 2{H}_{2}O$
$Mg{\left({HCO}_{3}\right)}_{2} + 2Ca{\left(OH\right)}_{2} \to 2{CaCO}_{3} + Mg{\left(OH\right)}_{2} + 2{H}_{2}O$

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