The colour of the sky is due to

Which of the following properties of colloids is used to measure the rate of migration of sol particles?

Which of the following techniques is used for the preliminary confirmation of nanoparticles?

When an excess of a very dilute aqueous solution of $KI$ is added to a very dilute aqueous solution of silver nitrate,the colloidal particles of silver iodide are associated with the Helmholtz double layer in the form of:

The maximum coagulating power for precipitating $As_2S_3$ sol is of

Which of the following electrolytes is the most effective coagulating agent for $Sb_2S_3$ sol among $Na_2SO_4$,$CaCl_2$,$Al_2(SO_4)_3$,and $NH_4Cl$?