Identify the example of zero-dimensional $(0D)$ nanostructure from the following.

Curdling of milk is caused due to the formation of which of the following acids by the bacteria?

Which of the following is used for the preparation of colloids?

The 'Purple of Cassius' is:

$A$ colloidal solution is subjected to an electric field,and the colloidal particles move towards the anode. The amount of electrolytes $BaCl_{2}$,$AlCl_{3}$,and $NaCl$ required to coagulate the given colloid is in the order:

When excess of electrolyte is added to a colloid,it