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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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Ionisation enthalpy of Cr is lower due to stability of `d^(5)` and the value for Zn is higher because its electron comes out from 4s orbital.
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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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    How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?

    How would you explain the fact the that the first ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium ?

    Why is first ionization enthalpy of Cu higher than that of Na ?

    First ionisation enthalpy of Be is higher than B.

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