Statement I : Mohr’s salt is composed of only three types of ions – ferrous, ammonium and sulphate. Statement II : If the molar conductance at infinite dilution of ferrous, ammonium and sulphate ions are and S , respectively, then the molar conductanc

Question

Given below are two statements : [2025]

Statement I : Mohr’s salt is composed of only three types of ions – ferrous, ammonium and sulphate.

Statement II : If the molar conductance at infinite dilution of ferrous, ammonium and sulphate ions are $x_{1}, x_{2}$ and $x_{3}$ S ${cm}^{2}$ ${mol}^{- 1}$ , respectively, then the molar conductance for Mohr’s salt solution at infinite dilution would be given by $x_{1} + x_{2} + 2 x_{3}$

In the light of the given statements, choose the correct answer from the options given below :

Smart Achievers · Accepted Answer

(3)

Statement I

Mohr's salt: ${FeSO}_{4} . {({NH}_{4})}_{2} {SO}_{4} . 6 H_{2} O$

Statement II:

By Kohlrausch law

$Λ_{m}^{\circ} (Mohr's salt) = λ_{m}^{\circ} ({Fe}^{2 +}) + 2 λ_{m}^{\circ} ({NH}_{4}^{+}) + 2 λ_{m}^{\circ} ({SO}_{4}^{2 -})$

$= x_{1} + 2 x_{2} + 2 x_{3}$

Solution

1 Both statements I and Statement II are false.

2 Statement I is false but Statement II is true.

3 Statement I is true but Statement II are false.

4 Both statements I and Statement II are true.

Ans.
(3)

Statement I

Mohr's salt: ${FeSO}_{4} . {({NH}_{4})}_{2} {SO}_{4} . 6 H_{2} O$

Statement II:

By Kohlrausch law

$Λ_{m}^{\circ} (Mohr's salt) = λ_{m}^{\circ} ({Fe}^{2 +}) + 2 λ_{m}^{\circ} ({NH}_{4}^{+}) + 2 λ_{m}^{\circ} ({SO}_{4}^{2 -})$

$= x_{1} + 2 x_{2} + 2 x_{3}$

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