Write statement for Law of Mass action.

Write expressions of ${\mathrm{K}}_{\mathrm{c}}$ for following chemical reaction.

$2{\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{SO}}_3\left(\mathrm{g}\right)$

Write expression of ${\mathrm{K}}_{\mathrm{c}}$ for following chemical reaction.

${\mathrm{N}}_2{\mathrm{O}}_4\left(\mathrm{g}\right)\rightleftharpoons 2{\mathrm{NO}}_2\left(\mathrm{g}\right)$

Differentiate irreversible and reversible reactions.