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The correct order of first ionisation en...

The correct order of first ionisation enthalpies of the following elements is

A

`BegtMggtCagtSrgtRagtBa`

B

`RagtBagtSrgtCagtMggtBe`

C

`BegtMggtCagtSrgtBagtRa`

D

`RagtSrgtBagtMggtCagtBe`

Text Solution

Verified by Experts

The correct Answer is:
A
Ionisation enthalpy decrease on going down the group.
So, `IEprop1/("size")`
however, radium has exceptionally higher ionisation enthalpy in group 2.
The first ionisation enthalpy in kJ `"mol"^(-1)` of alkali metal and alkaline earth metals are as following:
`Be=899,Mg=737`
`Ca=59.,Sr=549`
`Ra=509,Ba=603`
Hence, order of ionisation enthalpy is
`BegtMggtCagtSrgtRagtBa`
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Knowledge Check

  • The correct decreasing order of first ionisation enthalpies of five elements of the second period is

    A
    a) `Be gt B gt C gt N gt F`
    B
    b) `N gt F gt C gt B gt Be`
    C
    c) F gt N gt C gt Be gt B`
    D
    d) `N gt F gt B gt C gt Be`

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    C
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    D
    Bismuth

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    A
    'BltPltSltF'
    B
    BltSltPltF'
    C
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