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Balance the conversions : I^(-)(aq) ov...

Balance the conversions :
`I^(-)(aq) overset(H^(+))rarr I_(2)(g)` and `Fe^(2+)(aq) overset(H^(+))rarr Fe^(3+)(aq)`

Answer

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Knowledge Check

  • Identify A and B respectively in the following reactions : 4Au(s)+8CN^(-) (aq)+2H_(2)O (aq) overset(O_(2)(g))(rarr) A(aq)+4 OH^(-) (aq) overset(Zn (s))(rarr) B+2 Au (s)

    A
    `[Au(CN)_(2)]^(-), [Zn(CN)_(4)]^(2-)`
    B
    `Au(CN)_(4), [Zn(CN)_(4)]^(2-)`
    C
    `HCN, [Au(CN)_(4)]^(2-)`
    D
    `AuCN, [HCN]`

  • Given the standard oxidation potential Fe overset(+0.4V) to Fe^(2+) (aq) overset(-0.8 V) to Fe^(3+) (aq) , Fe overset(+0.9V) to Fe(OH)_2 overset(0.6V) to Fe(OH)_3 It is easier to oxidize Fe^(2+) to Fe^(3+) in :

    A
    Acid medium
    B
    alkalihne medium
    C
    neutral medium
    D
    both in acidic and alkaline mediums

  • Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below : 1/2Cl_(2(g))overset(1/2Delta_(diss)H^(odot))(rarr) Cl_(g)overset(Delta_(cg)H^(odot))(rarr)Cl_((g))^(-) overset(Delta_(hyd)H^(odot))(rarr)Cl^(-)_(aq) The energy involved in the conversion of 1/2Cl_(2(g)) to Cl_((aq))^(-) (using the data, Delta_(diss)H_(CL_(2))^(odot)=240" "KJ" "mol^(-1), Delta_(eg)H_(Cl)^(odot)=-349 KJ" "mol^(-1) , Delta_(hyd)H_(Cl^(-))^(odot)=-381KJ" "mol^(-1) ) will be

    A
    `-610 KJ" "mol^(-1)`
    B
    `-850" "KJ" "mol^(-1)`
    C
    `+120" "KJ" "mol^(-1)`
    D
    `+152" "KJ" "mol^(-1)`

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