NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

FeSO4 solution when mixed with (NH4)2SO4 solution in 1:1 molarratio forms a double salt FeSO4⋅(NH4)2SO4⋅6H2O which when dissolvedin water dissociates into simple ions to give tests for its constituent ions.When CuSO4 is mixed with aqueous ammonia a complex ion [Cu(NH3)4]2+is formed which does not give Cu2+ in the solution.