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The d & f Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
An aqueous solution containing Vx+ ion has magnetic moment equal to $\sqrt{15\text{BM}}$ Therefore, the x is:
  • A
    5
  • B
    2
  • C
    3
  • D
    4
✓

Answer

  1. 2

Explanation:

Let n be the number of unpaired electrons.

Magnetic moment $=\sqrt{\text{n(n+2)}}=\sqrt{15}$

⇒ n = 3

Atomic number of Vanadium is 23. So, it must loose all its 4s electrons to get 3 unpaired d electrons.

$\therefore$ value of x will be 2

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