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Solution


Q.

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 x1,x2 and x3 S cm2 mol−1, respectively, then the molar conductance for Mohr’s salt solution at infinite dilution would be given by x1+x2+2x3

In the light of the given statements, choose the correct answer from the options given below :
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: FeSO4.(NH4)2SO4.6H2O

Statement II:

By Kohlrausch law

Λm∘(Mohr's salt)=λm∘(Fe2+)+2λm∘(NH4+)+2λm∘(SO42-)

                               =x1+2x2+2x3