Draw a diagrammatic representation of the process of Reverse Osmosis.

Explain the ideal solution on the basis of the following points –

(A) Change in enthalpy

(B) Change in Volume

Explain the reason for the value of order of reaction is $1$. Why the value of molecularity is $2$ in the above reaction.

Show that in a first order reaction, time required for completion of $99.9\%$ is $10$times of half-life $\left({\mathrm{t}}_{1/2}\right)$ of the reaction.

Explain the following properties exhibiting by transition elements -

(A) Variable oxidation state

(B) Catalytic property

${\mathrm{CH}}_3\mathrm{OH}\stackrel{ \left[\mathrm{O}\right] }{\to }\left[\mathrm{A}\right]\stackrel{{\mathrm{CH}}_3 \mathrm{MgI} }{\to }\left[\mathrm{B}\right]\stackrel{ {\mathrm{H}}_2\mathrm{O} }{\to }\left[\mathrm{C}\right]$

Write the chemical formula of $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ in the above reaction sequence.