Which of the following group elements exhibits high melting and boiling points?

IVB

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VIB

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IIB

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Solution

The correct option is A VIB
The high melting and boiling points of d-block metals are attributed to the involvement of greater number of electrons from (n-1)d in addition to the ns electrons in the interatomic metallic bonding. In any row, the melting points of these metals rise to a maximum at $d^{5}$ except for anomalous values of Mn and Tc and fall regularly as the atomic number increases.

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