Q2. FeSO4 solution is mixed with (NH4)2SO4solution in the molar ratio of 1:1 molar. It gives a positive test for Fe2+ ion. However, when CuSO4 solution is mixed with aqueous ammonia in the molar ratio of 1:4 , it does not test positive for Cu2+ ion. Why?
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Answer:
Both the compounds i.e., FeSO4 .(NH4)2 SO4 .6H2O and [Cu(NH3)4] SO4 .5H2O fall under the category of addition compounds with only one major difference i.e., the former is an example of a double salt, while the latter is a coordination compound.
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Explanation:
Instead, they form a double salt, FeSO4. (NH4)2SO4. 6H2O (Mohr salt) which dissociates completed in ion in the solution. Hence, it gives the test of Fe2+ ions.
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