In capillary experiments for determining surface tension of water, for a given capillary, when can you expect maximum capillary rise? When contact angle is 45 degrees When contact angle is 120 degrees When contact angle is 180 degrees When the contact angle is zero For achieving maximum CMC reduction in SDS (sodium dodecyl sulfate) solutions, which of he following counterions will be most effective? Na2SO4 NaCl KCl MgCl2