81. Solving a chemistry problem

11. Expand the essence of fractional and systematic methods of analysis. Suggest options for the separation and detection of cations in the solutions below, which are a mixture of cations of various analytical groups, by fractional and systematic methods. Describe in detail the method of determination in a systematic way. Make equations of the corresponding reactions, indicate the conditions for the reactions.
11. NH4 , Mn2 Cr3 , Pb2