Among the following points indicated on the graph, which one represents equilibrium?

$$\begin{gathered} {\mathrm{N}}_2\left(\mathrm{g}\right)+2{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{NO}}_2\left(\mathrm{g}\right) \\ {\mathrm{NO}}_2\left(\mathrm{g}\right)\rightleftharpoons \frac{1}{2}{\mathrm{N}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right) \end{gathered}$$

If the equilibrium constant for the reaction $\left(\mathrm{i}\right)$ is $100$, then for the reaction $\left(\mathrm{ii}\right)$, its value is

Which of the following statements is correct?

Consider the following equilibrium in a closed container:

${\mathrm{N}}_2{\mathrm{O}}_4\left(\mathrm{g}\right) \rightleftharpoons 2 {\mathrm{NO}}_2\left(\mathrm{g}\right)$ At a fixed temperature the volume of the reaction container is halved. For this change, which of the following statements is correct regarding the equilibrium constant (${\mathrm{K}}_{\mathrm{p}}$) and degree of dissociation ($\mathrm{\alpha }$)?

${\mathrm{PCl}}_5$ dissociates in a closed container as ${\mathrm{PCl}}_5\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{PCl}}_3\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$.

If the total pressure at the equilibrium of the reaction mixture is $\mathrm{P}$, and the degree of dissociation of ${\mathrm{PCl}}_5$ is $\mathrm{\alpha }$, what is the partial pressure of ${\mathrm{PCl}}_3$?

At constant temperature, the equilibrium constant (${\mathrm{K}}_{\mathrm{p}}$) for the decomposition reaction: ${\mathrm{N}}_2{\mathrm{O}}_4\rightleftharpoons 2{\mathrm{NO}}_2,$ is expressed by ${\mathrm{K}}_{\mathrm{p}}=\frac{4{\mathrm{x}}^2\mathrm{P}}{(1-{\mathrm{x}}^2)}$, where $\mathrm{P}$ is the pressure and $\mathrm{x}$ is the extent of decomposition. Which of the following statements is true?