Which of the following statements is correct about zero order reaction?

Calculate Gibbs energy change for a reaction having $\Delta \mathrm{H}=31400 \mathrm{~J}, \Delta \mathrm{~S}=32 \mathrm{~J} \mathrm{~K}^{-1}$ at $1000^{\circ} \mathrm{C}$ ?

Identify the substrate 'S' in the following reaction.

Which from following is an example of multimolecular colloids?