Gold number is minimum in the case of

Comment on the statement that "colloid is not a substance but a state of substance".

The white of an egg is partly coagulated by heating,which can be converted back into a colloidal sol by adding some pepsin and a little $HCl$. This process is called:

Given below are two statements:
Statement $I:$ In the coagulation of a negative sol,the flocculating power of the three given ions is in the order - $Al^{3+} > Ba^{2+} > Na^{+}$
Statement $II:$ In the coagulation of a positive sol,the flocculating power of the three given salts is in the order - $NaCl > Na_{2}SO_{4} > Na_{3}PO_{4}$
In the light of the above statements,choose the most appropriate answer from the options given below:

$A$ colloidal solution is subjected to an electrical field. The particles move towards the anode. The coagulation of the same sol is studied using $NaCl$,$BaCl_2$,and $AlCl_3$ solutions. Their coagulating power should be:

If the dispersed phase is liquid and the dispersion medium is solid,the colloid is known as: