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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 2
Total: 43
FeSO4 solution mixed with (NH4)2SO4 solution in 1:1 molar ratio gives the test of Fe2+ ion but CuSO4 solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of Cu2+ ion. Explain why?
Solution:  
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.
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