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The electron gain ethalpy of F, Cl and B...

The electron gain ethalpy of F, Cl and Br are in the order.

A

`F gt Cl gt Br`

B

`Cl gt F gt Br`

C

`Br gt F gt Cl`

D

`Clgt Br gt F`

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(i) Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy, compare the oxidising power of F_(2) and Cl_(2) . (ii) Why are halogens coloured?

Electron gain enthalpies of halogens are largely negative.

Knowledge Check

  • Which arrangement for the three halogens Cl, Br and I is correct in the order of their increasing electron affinity :

    A
    Cl, Br, I
    B
    I, Br, Cl
    C
    Br, Cl, I
    D
    I, Cl, Br

  • The electron affinity of halogens shows the order:

    A
    `IgtClgtFgtBr`
    B
    `ClgtFgtBrgtI`
    C
    `FgtClgtIgtBr`
    D
    `FgtIgtClgtBr`

  • The order of E.A of F, Cl, Br, and I is :

    A
    F lt Clgt Brgt I
    B
    F gt Clgt Brgt I
    C
    F lt Cl lt Br lt I
    D
    F gt Cl lt Br lt I

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    How would you account for the following? The electron gain enthalpy with negative sign is less for oxygen than that of sulphur.

    Considering the parameters such as bond dissociation enthalpy,electron gain enthalpy and hydration enthalpy, compare the oxidising power of F_(2) and Cl_(2) .

    Fluorine has less -ve value of electron gain enthalpy than chlorine. Explain.

    Drift velocity of electrons in a conductor is of the order of

    Drift velocity of electrons in a conductor is of the order of :

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