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Assertion: The metals of 4d and 5d great...

Assertion: The metals of 4d and 5d greater enthalpies of atomisation than the corresponding elements of the 3d series.
Reason: The metal-metal bond in 4d and 5d series are stronger than those in the 3d series.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation of Statement -1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation of Statement-1

C

Statement-1 is True, Statement-2 is false

D

Statement-1 is False, Statement-2is True

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

Why is enthalpy of atomisation is the lowest for Zn in 3d series of transition elements ?

Knowledge Check

  • The 3d series starts from

    A
    Z = 21 to 30
    B
    Z = 22 to 30
    C
    Z = 20 to 30
    D
    Z = 31 to 40

  • Metal-Metal bonding is more frequent in 4d or 5d series than in 3d series due to

    A
    Their greater enthalpy of atomisation
    B
    Large size of orbitals which participate in bonding
    C
    their ability to involve both ns and (n-1)d orbitals in bond formation
    D
    The comparable size of 4d and 5d series elements

  • Assertion : In transition elements radii of 5d series are virtually the same as those of the corresponding members of 4d series. Reason : The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii.

    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.

    • Similar Questions

    Explore conceptually related problems

    How would you account for the following? (i) Cr^(2+) is reducing in nature while with the same d-orbital configuration (d^14) Mn^(3+) is an oxidising agent. (ii) In a transition series of metals, the metal which exhibits the greatest number of oxidation states occurs in the middle of the series. (iii) Metal-metal bonding is more frequent for the 4d and the 5d series of transition metals than for the 3d series.

    Why are the ionization energies of 5 d elements than 3d elements ?

    " The metallic radii of "4d" and "5d" series of transition metals are nearly the same.Why? "

    Why are the ionisation energies of 5d elements greater than 3d elements?

    Assertion : The value of enthaply of atomisation is maximum at about the middle of each series. Reason : There is one uparied electron per d-orbital and this results in stronger interatomic interaction.

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