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In 3d series, the enthalpy of atomisatio...

In 3d series, the enthalpy of atomisation of zinc is the lowest Why?

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To understand why the enthalpy of atomization of zinc is the lowest in the 3d series, we can break down the explanation into several steps: ### Step-by-Step Solution: 1. **Definition of Enthalpy of Atomization**: - The enthalpy of atomization is defined as the amount of energy required to break one mole of bonds in a substance to form gaseous atoms. In simpler terms, it measures how much energy is needed to convert a solid metal into its gaseous atomic form. 2. **Understanding Zinc in the 3d Series**: ...
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In the series Sc (Z= 21) to Zn ( Z= 30) , the enthalpy of atomisation of zinc is the lowest , i.e., 126 kJ mol^(-1) . Why ?

Read the given passage and answer the questions number 1 to 5 that follow : The lowest common oxidation state of transition metals is + 2. To form the M^(2+) ions from the gaseous atoms, the sum of the first and second ionisation enthalpy is required in addition to the enthsualpy of atomisation. The dominant term is the second ionisation enthalpy which shows unusually high values for Cr and Cu where M^(+) ions have the d^(5) and d^(10) configurations respectively. The value for Zn is correspondingly low as the ionisation causes the removal of 1s electron which results in the formation of stable d^(10) configuration. The trend in the third ionisation enthalpies is not complicated by the 4s orbital factor and shows the greater difficulty of removing an electron from the d^(5) (Mn^(2+)) and d^(10) (Zn^(2+)) ions. In general, the third ionisation enthalpies are quite high. Also, the high values for third ionisation enthalpies of copper, nickel and zinc indicate why it is difficult to obtain oxidation state greater than two for these elements. In the series Sc(Z = 21) to Zn(Z = 30), the enthalpy of atomisation of Zn is the lowest. Why?

Knowledge Check

  • Assertion : In the series Sc to Zn, the enthalpy of atomisation of zinc is the lowest. Reason : Zinc has greater number of unpaired electrons.

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

  • Lowest enthalpy of atomisation among the following is of:

    A
    Sc
    B
    Cr
    C
    Mn
    D
    Zn

  • The higher enthalpy of atomisation can be due to :

    A
    large number of unpaired electrons
    B
    strong interatomic interaction
    C
    strong metallic bonding
    D
    all of the above.

    • Similar Questions

    Explore conceptually related problems

    In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ mol^(-1) . Why ?

    In 3d series (Sc to Zn), the enthalpy of atomization of Zn is low. Why ?

    In the series Sc(Z=21) to Zn(Z=30) the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ mol^(-1) . Why?

    Statements-1. The metals of 4dand 5d transition series have greater enthalpies of atomisation than the corresponding elementsof the 3d series. Statements-2. The metal-metal bond in 4d and 5d series are stronger than those in the 3d series.

    In the series Sc (2 = 21) to Zn (Z=30), the enthalpy of atomisation of which element is least?

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