question_answer

The volume of a colloidal particle, \[C{{H}_{3}}-NH-NH-C{{H}_{3}}\,and\,{{C}_{2}}{{H}_{5}}OH\] as compared to volume of solute particle \[\text{C}{{\text{H}}_{\text{3}}}\text{C}{{\text{H}}_{\text{2}}}\text{N}{{\text{H}}_{\text{2}}}\text{ and }{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}\text{OH}\] in a true solution could be

A) \[N{{a}^{+}}\]                                   

B) \[C{{l}^{-}}\]

C) \[{{\tan }^{-1}}\left[ \frac{{{p}^{2}}+PQ+{{Q}^{2}}}{PQ} \right]\]              

D) \[{{\tan }^{-1}}\left[ \frac{{{p}^{2}}+{{Q}^{2}}-PQ}{PQ} \right]\]