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COMEDK2024Chemistryd and f Block ElementsActual

The correct order of increasing melting point is

Options

  1. ACr < Ti < V < Mn
  2. BV < Ti < Mn < Cr
  3. CTi < V < Cr < Mn
  4. DMn < Ti < V < Cr

Correct answer

D. Mn < Ti < V < Cr

Step-by-step solution

The melting points of transition metals depend on the strength of metallic bonding, which is related to the number of unpaired electrons available for delocalization in the metallic lattice. The electronic configurations of the given elements are: Ti (3d² 4s²) V (3d³ 4s²) Cr (3d⁵ 4s¹) Mn (3d⁵ 4s²) Generally, the melting point increases as the number of unpaired electrons increases, reaching a maximum at the middle of the series. However, Mn has a stable half-filled d -subshell ( 3d⁵ ), which makes its electrons les

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