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FeSO4 solutionmixed with (NH4)2SO4 solutionin 1:1 molar ratio gives the test of Fe2+ ion but 



Answer -

CuSO_4 solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of Cu_2+ ion. Explain why?

Answer

Both the compounds i.e., and 

 fall under the category of additioncompounds with only one major difference i.e., the former is an example of adouble salt, while the latter is a coordination compound.

A double salt is anaddition compound that is stable in the solid state but that which breaks upinto its constituent ions in the dissolved state. These compounds exhibitindividual properties of their constituents. For e.g. breaksinto Fe2+, NH4+, and SO42− ions. Hence, it gives a positive testfor Fe2+ ions.
A coordinationcompound is an addition compound which retains its identity in the solid aswell as in the dissolved state. However, the individual properties of theconstituents are lost. This happens because does not show the test for Cu2+. The ions present inthe solution of  are  and

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