Which among the following aqueous salt solutions is used in a conductivity cell to determine the cell constant?

The conductivity of $0.012 \ M$ $NaBr$ solution is $2.67 \times 10^{-4} \ S \ cm^{-1}$. What is its molar conductivity?

Kohlrausch's law states that at

Equivalent conductance of an electrolyte containing $NaF$ at infinite dilution is $90.1 \, \Omega^{-1} \, cm^2$. If $NaF$ is replaced by $KF$,what is the value of equivalent conductance? ........... $\Omega^{-1} \, cm^{2}$

If the values of $\Lambda_{\infty}$ of $NH_4Cl$,$NaOH$ and $NaCl$ are $130$,$217$ and $109 \ ohm^{-1} \ cm^2 \ equiv^{-1}$ respectively,the $\Lambda_{\infty}$ of $NH_4OH$ in $ohm^{-1} \ cm^2 \ equiv^{-1}$ is:

Calculate the molar conductivity of a solution having a concentration of $0.08 \ M$ and a resistivity of $5 \times 10^{-3} \ \Omega \ cm$.