What is the SI unit of conductivity ?

Q. Conductivity of an aqueous solution of 0.1 M HX (a weak mono-protic acid) is $5\times {10}^{4}S{m}^1$.Given: ${\wedge }_m^{\infty }\left[H^{+}\right]=0.04S{m}^{2}mo{l}^{-1};{\wedge }_m^{\infty }\left[X^{-}\right]=0.01S{m}^{2}mo{l}^{-1}$
Find $p{K}_a\left[HX\right].$

Q. The molar conductance at infinite dilution of $BaC{l}_2$, $NaCl$, $NaOH$ are
$280\times {10}^{-4}$,$126.5\times {10}^{-4}$,$248\times {10}^{-4}S{m}^{2}mo{l}^{-1}$ respectively. The molar conductance at infinite dilution for $Ba(OH{)}_2$ is:

Q. Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1M is 100$\Omega$. The conductivity of this solution is 1.29$S{m}^{-1}$. Resistance of the same cell when filled with 0.02M of the same solution is 520$\Omega$. The molar conductivity of 0.02M solution of the electrolyte will be.
(1) $124\times {10}^{-4}{Sm}^2{}^{-1}$
(2) $1240\times {10}^{-4}{Sm}^2{}^{-1}$
(3) $1.24\times {10}^{-4}{Sm}^2{}^{-1}$
(4) $12.4\times {10}^{-4}{Sm}^2{}^{-1}$