If ${\mathrm{\Lambda }}_c$of ${\mathrm{NH}}_4\mathrm{OH}$ is $11.5{\mathrm{\Omega }}^{-1}{\mathrm{cm}}^2{\mathrm{mol}}^{-1}$, its degree of dissociation would be

(Given ${\lambda }_{{\mathrm{NH}}_4^{+}}^{\mathrm{\infty }}=73.4{\mathrm{\Omega }}^{-1}{\mathrm{cm}}^2{\mathrm{mol}}^{-1}\text{ and }{\lambda }_{\mathrm{OH}}^{\mathrm{\infty }}=197.6{\mathrm{\Omega }}^{-1}{\mathrm{cm}}^2{\mathrm{mol}}^{-1}.$) 

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