JEE Main20254 Apr 2025Evening ShiftChemistryElectrochemistryActual
The molar conductance of an infinitely dilute solution of ammonium chloride was found to be 185 ~S ~cm ^2 ~mol ⁻¹ and the ionic conductance of hydroxyl and chloride ions are 170 and 70 ~S ~cm ^2 ~mol ⁻ ^1 , respectively. If molar conductance of 0.02 M solution of ammonium hydroxide is 85.5 ~S ~cm ^2 ~mol ⁻¹ , its degree of dissociation is given by x 10⁻¹ . The value of x is ________ (Nearest integer)
Correct answer
0
Step-by-step solution
aligned & _ m ^ of NH ₄ Cl =185 & ( _ m ^ )_ NH ₄⁺ + ( _ m ^ )_ Cl ⁻ =185 & ( _ m ^ )_ NH ₄⁺ =185-70=115 Scm ^2 ~mol ⁻¹ & ( _ m ^ )_ NH ₄ OH = ( _ m ^ )_ NH ₄⁺ + ( _ m ^ )_ OH ⁻ & =115+170 & ( _ m ^ )_ NH ₄ OH =285 Scm ^2 ~mol ⁻¹ aligned aligned degree of dissociation & = ( _ m )_ NH ₄ OH ( _ m ^ )_ NH ₄ OH & = 85.5 285 & =0.3 & =3 10⁻¹ aligned