Limiting molar conductivity of `Mg^(2+)` and `Cl^(-)` ions in water is 106.0 and `76.3 S cm^2 "mol"^(-1)` . The limiting molar conductivity of magnesium chloride (in `Scm^2 " mol"^(-1)` ) in water is

Options

A. 182.3
B. 258.6
C. 288.3
D. 364.6

Answer

B

Explanation

Molar conductivity of
`Mg^(2+) (Lamda_(mg^(2+))^@ ) = 106 Scm^2`/mol
molar conductivity of `Cl^(-)` ion (`Lamda_(Cl^(-))^@` )
` = 76.3 S cm^2` /mol
molar conductivity of `MgCl_2 = Lamda_m^@` of ` Mg^(2+) + 2 Lamda_m^@`
` = 258.6 S cm^2`/ mol