The following pairs of soluble solutions can be mixed. In some cases, this leads to the formation of an insoluble precipitate. Decide, in each case, whether or not an insoluble precipitate is formed.
K2S and NH4Cl
CaCl2 and NH4CO3
Li2S and MnBr2
Ba(NO3)2 and Ag2SO4
RbCO3 and NaCl