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Following ions are given : Cr^(2+), Cu^(2+), Cu^(+), Fe^(2+),Fe^(3+),Mn^(3+) Identify the ion which is (i) a strong reducing agent. (ii) unstable in aqueous solution. (iii) a strong oxidising agent. Give suitable reason in each. |
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Answer» Solution :(i) `Cr^(2+)` is a strong reducing agent because `E_(Cr^(3+)//Cr^(2+)=-0.41 V.)^(o)` The values with other metal IONS are positive. (ii) `Cu^(+)` ion is unstable in aqueous solution because the ENTHALPY of hydration `Cu^(+)` ion is very small. (iii) `Cu^(2+)` is a strong oxidising agent because it has a tendency to GET REDUCED with `E^(o)` value of `+0.34` V. |
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