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Explain why Cu^(+) ion is not stable in ...

Explain why `Cu^(+)` ion is not stable in aqueous solutions ?

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To explain why the `Cu^(+)` ion is not stable in aqueous solutions, we can break down the reasoning into several steps: ### Step 1: Understanding the Stability of Copper Ions Copper can exist in two oxidation states in aqueous solutions: `Cu^(+)` and `Cu^(2+)`. Among these, `Cu^(2+)` is known to be stable in aqueous solutions. ### Step 2: Energy Considerations The formation of `Cu^(2+)` from elemental copper (`Cu`) requires an input of energy. This is because removing an electron from a neutral copper atom to form a `Cu^(+)` ion requires energy, and further removing another electron to form `Cu^(2+)` also requires energy. ...
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State the reason for the following : (i) Cu (I) ion is not stable in an aqueous solution. (ii) Unlike Cr^(3+),Mn^(2+),Fe^(3+) and the subsequent other M^(2+) ions of the 3d series, the 4d and 5d series metals generally do not form stable oxidation states.

(a) What is meant by the term lanthanoid contraction ? What is it due to and what consequences does it have on the chemistry of elements following lanthanoids in the periodic table ? (b) Explain the following observations : (i) Cu^(+) ion is unstable in aqueous solutions . (ii) Although Co^(2+) ion appears to be stable , it is easily oxidised to Co^(3+) ion in the presence of a strong ligand. (iii) The E_(Mn^(2+)//Mn)^(@) value for manganese is much more than expected from the trend for other elements in the series.

Knowledge Check

  • Cu^(+) ion is not stable in aqueous solution because because of dispropotionation reaction. E^(@) value of disproportionation of Cu^(+) is [E_(Cu^(2+)//Cu^(+))^(@)=+ 0.15 V, E_(Cu^(2+)//Cu)^(@)=0.34 V]

    A
    second ionisation entyhalpy of copper is less than the first ionisation enthalpy
    B
    large value of second ionisation enthalpy of copper is compensated by much more negative hydration energy of `Cu_((aq))^(2+)`
    C
    hydration energy of `Cu_((aq))^(2+)` is much more negative than that of `Cu_((aq))^(2+)`
    D
    many copper (I) compounds are unstable in aqueous solution and undergo disproportionation rection.

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    Explore conceptually related problems

    Cu^(+) ion is not stable in aqueous solution because because of dispropotionation reaction. E^(@) value of disproportionation of Cu^(+) is [E_(Cu^(2+)//Cu^(+))^(@)=+ 0.15 V, E_(Cu^(2+)//Cu)^(@)=0.34 V]

    (a) Following are the transition metal ions of 3d series: Ti^(4+),V^(2+),Mn^(3+),Cr^(3+) (Atomic numbers: Ti=22,V=23,Mn=25,Cr=24 ) Answer the following: (i) Which ion is most stable in an aqueous solution and why? (ii) Which ion is a strong oxidising agent and why? (iii) Which ion is colourless and why? (b) Complete the following equations: (i) 2MnO_(4)^(-)+16H^(+)+5S^(-)to (ii) KMnO_(4)overset(heat)to

    Which of the following ions is the most stable in aqueous solution ? (At . No . Ti = 22, V = 23, Cr = 24, Mn = 25)

    Out of Cr^(2+) and Cr^(3+) , which one is stable in aqueous solution?

    Copper (I) ions are not known in aqueous solution.

    Assertion : Cuprous ion (Cu^(+)) is colouless whereas cupric ion (Cu^(++)) is blue in the aqueous solution. Reason : Cuprous ion (Cu^(+)) has unpaired electrons while cupric ion (Cu^(++)) does not .

    Which one of the following species is stable in aqueous solution?

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