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D and F Block Elements question

2008 · Q103
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D and F Block Elements question

2008 · Q103

NEETChemistryD and F Block ElementsMCQ+4 / −1
The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is
  1. A
    Mn > Cr > Ti > V
  2. B
    Ti > V > Cr > Mn
  3. C
    Cr > Mn > V > Ti
  4. D
    V > Mn > Cr > Ti
View written solutionFree

Correct answer: C

Ti ; Z (22) is 1s22s22p63s23p64s23d2

V ; Z (23) is 1s22s22p63s23p64s23d3

Cr ; Z (24) is 1s22s22p63s23p63d54s1

Mn ; Z (25) is 1s22s22p63s23d54s2

The second electron in all the cases (except Cr) is taken out from 4s-orbital and for Cr it is taken from completely half filled 3d-orbital. The force required for removal of second electron will be more for Mn than others (except for Cr) due to having more positive charge. Based on this we find the correct order Mn > V > Ti.

i.e. Cr > Mn > V > Ti.

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