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The atomic number of V,Cr, Mn and Fe are...

The atomic number of `V,Cr, Mn and Fe` are respectively `23,24,25 and 26.` Which one of these may be expected to have the highest second ionization enthalpy?

A

Variable oxidations state

B

Cr

C

Mn

D

Fe

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Verified by Experts

The correct Answer is:
B
Electronic configuration of

(by first ionisation potential). This is stable electronic configuration, hence formation of `Cr^(2+)` by second ionisation potential requires higher enthalpy.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-D - AND F-BLOCK ELEMENTS-Practice exercise (Exercise 1)
  1. Acidified potassium permanganate soultion is decoloursied by

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  2. KMnO(4) in basic medium is used as

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  3. The atomic number of V,Cr, Mn and Fe are respectively 23,24,25 and 26....

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  4. In the following figure the Cr-O-Cr bond angle is of X^(o). What is th...

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  5. Acidified KMnO(4) can be decolourised by:

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  6. On heating KMnO(4), one among the following is not formed:

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  7. KMnO(4) forms dark purple crystals, which are isostructural with those...

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  8. In alkaline H(2)O(2),Cr(2)O(7)^(2-) changes to tetraperoxo species… ha...

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  9. K(2)Cr(2)O(7)//H^(+) changes to green by

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  10. An explosion takes place when conc. H2SO4 is added to KMnO4. Which of ...

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  11. The outer electronic configuration of Gd (At.No. 64) is

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  12. Identify the incorrect statement among the following.

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  13. The atomic size of cerium and promethium is quite close, because

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  14. The lanthanide contraction relates to

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  15. Because of lanthnoid contraction, which of the following pairs of elem...

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  16. Ln^(3+) (trivalent lanthanides ions ) have electronic configuration.

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  17. The basicity of lanthanoid hydroxides, across the lanthanoid series

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  18. There are 14 elements in actinoid series. Which of the following eleme...

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  19. lanthanoid contraction, the unique in the chemistry of lanthanoids, is...

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  20. Misch metal is

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