Count the number of correct statements.
(a) Minimum potential required for electrophoresis is called zeta potential
(b) Tyndall effect increases with increase in difference in size of particle and wavelength of light used.
(c ) Minimum amount of electrolyte in millimoles per 100 ml required to cause precipitate in two hours is called coagulating value.
(d) Zeolites are shape-selective catalyst.