Why does molten sodium chloride conduct electricity?

If $y$ is a function of $x$ and $\log(x+y) = 2xy$,then the value of $y'(0)$ is

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

Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?

The half-life of a radioactive nucleus is $50 \ days$. The time interval $(t_2 - t_1)$ between the time $t_2$ when $\frac{2}{3}$ of it has decayed and the time $t_1$ when $\frac{1}{3}$ of it has decayed is ......... $days$.

The study of homologous structures in mature organisms provides evidence for evolutionary relationships among certain groups of organisms. Which field of study includes this evidence of evolution?