Molar conductance at infinite dilution of Mg(NO₃)₂, H₂SO₄ and HNO₃ solution in water are x, y and z respectively. What is the Molar conductance of MgSO₄ solution? 

x + y - 2z

Mg(NO₃)₂ ⇔ Mg²⁺ + 2NO₃^-     

Λ_Mg(NO3)2 = Λ_Mg²⁺ + 2Λ_NO3^-    

x = Λ_Mg²⁺ + 2Λ_NO3^-    .......(i)

H₂SO₄ ⇔ 2H⁺ + SO₄^2-

Λ_H2SO4 = 2Λ_H⁺ + Λ_SO4^2-

y = 2Λ_H⁺ + Λ_SO4^2-      .......(ii)

HNO₃ ⇔ H⁺ + NO₃^- 

Λ_HNO3 = Λ_H⁺ + Λ_NO3^- 

z = Λ_H⁺ + Λ_NO3^-        .......(iii)

On Applying (i) + (ii) - 2(iii), we get

Λ_MgSO4 = x + y - 2z