5. (A) Answer the following questions:

(i) Which element of the first transition series has the highest second ionization enthalpy?

(ii) Which element of the first transition series has highest third ionization enthalpy?

(iii) Which element of the first transition series has lowest enthalpy of atomization?

(B) Identify the metal and justify your answer:

(i) CarbonylmM(CO)₅

(ii) MO₃F

 

<p><strong>5. (A) (i) </strong>Out of all the elements of the first transition series copper has the highest second ionisation enthalpy.</p><p>Electronic configuration of Copper is: 3d¹⁰4s¹</p><p>After the Loss of first electron from the 4s copper acquires 3d¹⁰ configuration which is stable. Therefore, removal of second electron from the field 3-D orbital is very difficult and requires high amount of energy.</p><p><strong> (ii) </strong>Among the elements of first transition series zinc has the highest third ionisation enthalpy. Electronic configuration of zinc is: 3d¹⁰4s²</p><p>After the loss of two electrons from 4s orbital, Z and +2 Ion acquires 3d¹⁰ fully filled configuration which is highly stable therefore removal of third electron from 3d&nbsp;10orbital will be more difficult and requires a large amount of energy.</p><p><strong> (iii) </strong>Zinc is the element of the first transition series that has the lowest enthalpy of atomisation. The electronic configuration of zinc is: 3d¹⁰4s².This is because it has filled 3d-subshell and filled 4s-subshell so no unpaid electron is available for metallic bonding.</p><p>&nbsp;</p><p><strong> (B)</strong> <strong> (i)&nbsp;</strong>CarbonylmM (CO)₅</p><p><strong>Ans:</strong> Fe (CO)₅as per EAN Rule.&nbsp;</p><p><strong>EAN Rule:</strong> Effective atomic number (EAN), number that represents the total number of electrons surrounding the nucleus of a metal atom in a metal complex.&nbsp;</p><p><strong> (ii)</strong>&nbsp;MO₃F</p><p><strong>Ans:</strong> The M in the given complex is in +7 O.S.</p>

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