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NEET 2009
Exam
NEET
Year
2009
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2009 · Chemistry · d and f Block Elements

Which of the following complex ions is expected to absorb visible...

Which of the following complex ions is expected to absorb visible light ? (At no. Zn=30,Sc=21,Ti=22,Cr=24\mathrm{Zn}=30, \mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Cr}=24 )Which of the following complex ions is expected to absorb visible light ? (At no. Zn=30, Sc=21, Ti=22, Cr=24 )

Options

  1. A\left[\mathrm{Zn}\left(\mathrm{NH}_3\right)_6\right]^{2+}
  2. B\left[\mathrm{Sc}\left(\mathrm{H}_2 \mathrm{O}\right)_3\left(\mathrm{NH}_3\right)_3\right]^{3+}
  3. C\left[\mathrm{Ti}(\mathrm{en})_2\left(\mathrm{NH}_3\right)_2\right]^{4+}
  4. D\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{3+}

Correct answer

D. \left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{3+}

Step-by-step solution

Cr3+→Is2,2 s22p6,3 s23p63 d3\mathrm{Cr}^{3+} \rightarrow \mathrm{Is}^2, 2 \mathrm{~s}^2 2 \mathrm{p}^6, 3 \mathrm{~s}^2 3 \mathrm{p}^6 3 \mathrm{~d}^3 Which of the following complex ions is expected to absorb visible light ? (At no. Zn=30, Sc=21, Ti=22, Cr=24 )
Unpaired electron shows colour so absorb visible light.
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