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NEET2008ChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn (25) is

Options

  1. ATi > V > Cr > Mn
  2. BCr > Mn > V > Ti
  3. CV > Mn > Cr > Ti
  4. DMn > Cr > Ti > V

Correct answer

B. Cr > Mn > V > Ti

Step-by-step solution

Cr (24) [ Ar ] 3 d^5 4 s^1 After removing one electron from chromium, the resulting structure becomes more stable. Hence Cr has higher second ionisation enthalpy. Thus, the correct order is Cr > Mn > V > Ti

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