Which types of isomerism is shown by 2,3-dichlorobutane?

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?

The volume of a colloidal particle, V_C as compared to the volume of a solute particle in a true solution V_S, could be

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be :