Which from following substances is classified as macromolecular colloid?

What is the total number of unit cells shared by each corner particle of bcc unit cell?

Which of the following is used as reagent in Etard reaction?

For a certain reaction, $\Delta \mathrm{H}=-210 \mathrm{~kJ}$ and $\Delta \mathrm{S}=-150 \mathrm{~kJ} \mathrm{~K}^{-1}$ Find the temperature so that $\Delta \mathrm{G}=0$.