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Why first ionisation enthalpy of Cr is l...

Why first ionisation enthalpy of Cr is lower than that of Zn?

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`._(24)Cr= [Ar]3d^(5) 4s^(1)`. It can easily lose electron because that will give stable `d^(5) ` configuration `. _(30)Zn = [Ar] 3d^(10) 4s^(2) `. Electron has to be removed from 4s orbital which is closer to nucleus and is held more strongly.
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Why is first ionisation enthalpy of Cr lower than that of Zn?

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Knowledge Check

  • Assertion (A)First ionisation enthalpy of Cr is lower than that of Zn. Reason ( R) IE of Cr is lower due to the stability of d^5 and the value for Zn is higher.

    A
    Both Assertion and Reason are correct explanation of the Assertion
    B
    Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
    C
    Assertion is correct but Reason is incorrect
    D
    Both Assertion and Reason are incorrect

  • Assertion: The first ionisation enthalpy of aluminium is lower than that of magnesium. Reason : Ionic radius of aluminium is smaller than that of magnesium.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If the assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

  • The first ionisation energy of silicon is lower than that of

    A
    Aluminium
    B
    carbon
    C
    potassium
    D
    calcium

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